Database Develop

[Tutorial] How to test out wireless providers signal strength without a SIM

Many of you may be looking to test out different wireless providers with your Nexus 5, but the cost of switching may not be cheap. Thankfully, the Nexus 5 supports a nifty feature called "network camping." This allows it to "camp" on any network it supports without registering with it. Most phones can do this, but what makes the Nexus 5 special is the fact that it reports this network info all the way back down to the user. More specifically, it reports all the network info, including the signal.
Warnings
1. This will cause your phone to stop receiving calls until you undo all the steps
2. This probably doesn't work on Sprint registered Nexus 5s.
3. Make sure you write down previous values and switch the phone back, especially for step #2. If after this it still does not show a signal bar, go into Settings -> More... -> Mobile Networks -> Network Operators and select "Choose Automatically"
Step 1 - Remove SIM card
Removing the SIM card will trigger the phone to start scanning automatically.
Alternatively, you can go into Settings -> More... -> Mobile Networks -> Network Operators and select a network you cannot connect to (it should display "Your SIM card is not allowed to connect to this network" if successful)
Step 2 - Set the network type you want to connect to
Dial *#*#4636#*#* in the dialer (where you make calls). It will show a secret menu. Go to "Phone Information" and go down to the "Set preferred network type" dropdown. Select one of GSM only, WCDMA only, or LTE only. In short, GSM=2G, WCDMA=3G, LTE=4G. CDMA will not work, at least on phones that are not configured for Sprint.
Select the network types you care about. In generally, most providers globally require a fallback 2G or 3G network for voice calls. So, if you only have LTE coverage, you wont be able to make calls. So it is best to ensure you choose one that has at least a decent 2G or 3G network.
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Step 3 - Get an app that can read this information
Many apps that support the newer Android 4.2+ CellID API will allow you to read the network information. You can use CellMapper (which I have written), but you can use any app you want (I haven't tested with any others).
As a bonus, you can use CellMapper to map out cell towers and plot coverage for other people, sparing them the trouble of going through all this
EDIT: I have updated the app to have signal bars,
Once you have the updated app (see screenshot below), you can ignore the signal mapping section if you want. However, I recommend reading it to understand how bars map to signal
In the above, the app lists all the possible antennas your phone could connect to. Each one is called a "cell." The first one is the one your phone will most likely connect to, so you can ignore the rest. Generally, in urban areas, you will see dozens, whereas in rural areas you may see 1 or 2 only.
You will need to translate the "MCC" and "MNC" under the cell section to a network name. For example, Rogers in Canada is MCC 302 (Canada) and MNC (720) Rogers. Telus in Canada is 302 220. You can look this up on the following wikipedia page: http://en.wikipedia.org/wiki/Mobile_country_code. Just search for your country and find the matching MCC/MNC. Some other examples are 310 (USA) and 260 (T-Mobile), 311 (USA) 480 (Verizon)
Whatever app you choose, it will provide a signal level reading (in dBm). In the above screens, it is the large negative number to the right.
The dBm reading is essentially the signal strength/quality of the signal. Based off this reading, you can determine if you will have coverage or not.
dBm to "bars" mapping
dBm is translated to "bars" in the following manner for AOSP:
LTE
-95 dBm = 4 bars
to
-105 dBm = 3 bars
to
-115 dBm = 2 bars
to
-115 dBm = 1 bar
to
-140 = no signal
GSM/UMTS
-89 = 4 bars
to
-97 = 3 bars
to
-103 = 2 bars
to
-113 = 1 bar
So, in my screenshots above, I have Rogers reading -104 dBm for LTE (4 bars) and Telus reading -67 dBm (4 bars). Likewise, I also have WIND Mobile reading -81 dBM for UMTS (4 bars)
Step 4 - Visit the places where you want to test if you have reception
This part is easy, just visit places like underground parking lots, subways, etc in order to test out which wireless provider has the best signal to suit the places you most frequently visit.

Thanks a ton for the information. Not needed in my case but i hope it will help out lots of N5 users.

is it possible to get the frequency bandwidth from the modem? (eg LTE connection is on a 10+10 mhz bandwidth?)

paperWastage said:
is it possible to get the frequency bandwidth from the modem? (eg LTE connection is on a 10+10 mhz bandwidth?)
Click to expand...
Click to collapse
No, that is hidden away from the user layer, unfortunately. The most you can get is the EARFCN from the Field Test Mode to see what frequency the phone is on, and based off this you can see what the provider has in terms of bandwidth on that band.

Nice! thanks. I have been looking for something like this. Would be nice if a line was added to the cell that said what network it was based on MCC/MNC

Boost HTC Desire 626s LTE bands unlocked

It appears, Sprint/Boost activation is required for "LTE based roaming" on the 626s. After unlocking LTE bands, I have so far have been successful in obtaining LTE with Band 5 only that is 850 Mhz. This is similar in the Sprint HTC A9 also. The EARFCN of 626s is locked to 2555 Mhz or all the remaining functional bands are mapped to band 5. Band 5 provides excellent indoor coverage and it's absolutely worth the effort. S-On phones can also be modified for LTE, S-Off and supercid helps make it better. It appears band 2, 3, 5, 13, 17, 25, 26 work after changing these values. Modification of these values do not hinder GSM/CDMA/Evdo modem characteristics. It will not damage the hardware or the IMEI. UMTS 2100 Mhz may never work because the UE mode seems to have a band mask. Replacing the carrier_policy.xml in policyman efs explorer, QPST will further enchance LTE capabilities. This has been extensively tested on JIO, Airtel and Vodafone 4G networks of India.
1. Pref S-off (S-on will work)
2. SPC code
3. QXDM
4. In QXDM NV browser, make NV items 6828, 6829 and 65633 to 131518
5. Change item 1877 to 562950035751815
6. Change item 4548 to 562950035751815
7. Reboot phone, phone will automatically latch to available 4G LTE networks.
**The same values and process is also successful for Sprint HTC A9 and Sprint Samsung Galaxy S5 G900P. A factory reset/ firmware flash does not revert the changes made.

How did u resolve pls? U flashed a radio.img that unlocked the bands or u added the bands with dfs, qxdm?

doyin116 said:
How did u resolve pls? U flashed a radio.img that unlocked the bands or u added the bands with dfs, qxdm?
Click to expand...
Click to collapse
You can flash cdma_record.img from bootloader mode if your phone is S-off. This will work only if values were messed due to band mods or programming methods. Let me know if you require any of the files.

Hi, thanks for your reply but I don't have a messed up band. What I'm trying to do is to be able to use 3G/UMTS and LTE but I can't as I can only use 2g. Checked my bands and found they work only in d US. I flashed UMTS bands but I still cannot use 3G ( I wonder why). The UMTS band in my country is 2100 could your explanation on band masking of 2100 be the reason?. Will try unlocking the LTE bands using your guide to see what happens although I'm not conversant with qxdm as I'm a noob but will try to find my way around

doyin116 said:
Hi, thanks for your reply but I don't have a messed up band. What I'm trying to do is to be able to use 3G/UMTS and LTE but I can't as I can only use 2g. Checked my bands and found they work only in d US. I flashed UMTS bands but I still cannot use 3G ( I wonder why). The UMTS band in my country is 2100 could your explanation on band masking of 2100 be the reason?. Will try unlocking the LTE bands using your guide to see what happens although I'm not conversant with qxdm as I'm a noob but will try to find my way around
Click to expand...
Click to collapse
Yes exactly, the RF NV items of UMTS 2100 mhz are active but there is a UE and band mask. It is in the modem firmware. Some properties of the modem cannot be changed via QDART, QPST, QXDM. It is also likely the device does not have specific antennas as required for different bands and frequencies. There is a freq lock at item number 53185. This item is not accessible till now.

Where to from here
dr.faramroze said:
You can flash cdma_record.img from bootloader mode if your phone is S-off. This will work only if values were messed due to band mods or programming methods. Let me know if you require any of the files.
Click to expand...
Click to collapse
dr.faramroze said:
Yes exactly, the RF NV items of UMTS 2100 mhz are active but there is a UE and band mask. It is in the modem firmware. Some properties of the modem cannot be changed via QDART, QPST, QXDM. It is also likely the device does not have specific antennas as required for different bands and frequencies. There is a freq lock at item number 53185. This item is not accessible till now.
Click to expand...
Click to collapse
I suppose I'm doomed then. Or alternatively if and when a custom ROM/kernel arrives for this device, will it b able to remove the mask? If I unlock the LTE bands, will they work even without the UMTS? Thanks for your time

@dr.faramroze where can i find the following files?
/policyman/carrier_policy.xml
/policyman/device_config.xml
/policyman/ue_mode
/policyman/locked
i've opened the policyman.conf from qpst efs explorer and found the links to these files. just curious what is in these files that prevent access to some lte bands.
I know this thread is for 626s but i am exhausted trying to unlock band 40 on my M8 Unlocked Intl version.
hope you can help me out with it.

Hello, Open efs explorer in QPST, map the com ports, send the SPC. You will see a directory named conf. /policyman/carrier_policy.xml is in there. But wait. This is mainly for carrier protected versions not applicable to international models. Altering this xml file is for Sprint, Verizon, China Unicom, China Telecom CDMA etc. For international M8, only calculate the additional LTE bands in NV calc from playstore. Select your bands and write in 6828, 6829 and 65633.

Please help me with the procedure for flashing LTE bands. Can't find items 6828, 6829 in my QXDM NV browser. What version of QXDM did you use?. Would appreciate it a lot if you can give me a step by step tutorial of how to flash the LTE bands. Thanks

dr.faramroze said:
It appears, Sprint/Boost activation is required for "LTE based roaming" on the 626s. After unlocking LTE bands, I have so far have been successful in obtaining LTE with Band 5 only that is 850 Mhz. This is similar in the Sprint HTC A9 also. The EARFCN of 626s is locked to 2555 Mhz or all the remaining functional bands are mapped to band 5. Band 5 provides excellent indoor coverage and it's absolutely worth the effort. S-On phones can also be modified for LTE, S-Off and supercid helps make it better. It appears band 2, 3, 5, 13, 17, 25, 26 work after changing these values. Modification of these values do not hinder GSM/CDMA/Evdo modem characteristics. It will not damage the hardware or the IMEI. UMTS 2100 Mhz may never work because the UE mode seems to have a band mask. Replacing the carrier_policy.xml in policyman efs explorer, QPST will further enchance LTE capabilities. This has been extensively tested on JIO, Airtel and Vodafone 4G networks of India.
1. Pref S-off (S-on will work)
2. SPC code
3. QXDM
4. In QXDM NV browser, make NV items 6828, 6829 and 65633 to 131518
5. Change item 1877 to 562950035751815
6. Change item 4548 to 562950035751815
7. Reboot phone, phone will automatically latch to available 4G LTE networks.
**The same values and process is also successful for Sprint HTC A9 and Sprint Samsung Galaxy S5 G900P. A factory reset/ firmware flash does not revert the changes made.
Click to expand...
Click to collapse
Hi, can you help me? I have two 626s. Using in GSM network. One from Verizon works great have HSDPA connection working. Another from VirginMobile (same HW as Sprint a32ewhl 0PM9200) it is unlocked for GSM but HSDPA do not work. "G" indicator near antenna means GPRS or what, speedtest shows 0,2Mbps only.
Can you help me to make it work with HSDPA?
P.S. Have many boards - sprint, verison, virgin - can backup all nv-items before unlock and after unlock using XTC2clip if you need

nick,
I have the same 626s, sprint version. It seems to show G even when it connects HSPA+. I am checking that with the LTE discovery app.
Also, I could not get them to connect to LTE with any ATT sim

rchir said:
nick,
I have the same 626s, sprint version. It seems to show G even when it connects HSPA+. I am checking that with the LTE discovery app.
Also, I could not get them to connect to LTE with any ATT sim
Click to expand...
Click to collapse
No, I have low speed 0,2mbps so I have no 3G indeed

Need help modifying NV items!!
dr.faramroze said:
3. QXDM
4. In QXDM NV browser, make NV items 6828, 6829 and 65633 to 131518
5. Change item 1877 to 562950035751815
6. Change item 4548 to 562950035751815
7. Reboot phone, phone will automatically latch to available 4G LTE networks.
.
Click to expand...
Click to collapse
Can you or anyone else guide me in changing the item values? In Step 4 are you saying to change the NV items values to 131518? 65633 is system so how can i modify it? Or are you saying to create these Items? They are already present on my Boost Mobile 626s. Now with steps 5 and 6 I changed the previous values to what you specified.
Before this i changed some NV Items to simunlock the Desire 626s which seemed to work but still cannot pull any cellular signal because these bands are still locked?
I am not new to QPST I used it years ago with flip phones but never toyed around with QXDM.
This will be the second Boost unlock for opening GSM bands I have done. Before was a J3 Emerge but i had all needed nv items already to file and just needed to write them. This time it's a bit different of course.
Any help is much appreciated guys.

I accidenly cleared the values for 65633. Can anyone grab me a backup?
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Figured it all out except for the LTE Band Pref error i made. Thank you for this guide.
Like user @rchir I too was only able to achieve HSPA+.

XT1254 prefered LTE band, "LTE only" radio mode

When I set radio modem in LTE/GSM(auto) mode all is ok - phone registered and works in LTE network, but when I set to "LTE only" mode, phone goes to enternal network search and found nothing (no network registered).
I think it's because in "LTE only" mode phones set to only Verizon LTE band 13, not global LTE.
How I can make phone works in mode "LTE only"?
If I need to change this "prefered" Verizon LTE band, how can I do this?
I use Verizon XT1254 bootloader unlocked + SU4TL-49 (5.1) stock in LTE band 3 (1800).
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Metalor said:
I use XT1254 bootloader unlocked + SU4TL-49 (5.1) stock in LTE band 3 (1800).
Click to expand...
Click to collapse
Not wise to go LTE only.
If you go LTE only, what happens when there's no LTE?
Like when there's only 3G coverage?
Or want to make a phone call? (Phone needs to drop down to 3G coverage, since you are not using Verizon and would not have access to Verizon's VoLTE. I'm in the U.S. on AT&T and drop down to HSPA temporarily for phone calls on my Quark, since I don't have access to AT&T's VoLTE.)
I would never go to LTE only as that would ensure my phone could not make phone calls (on the carrier I use) or even have data at all times (in poor LTE coverage areas).

ChazzMatt said:
Not wise to go LTE only.
Click to expand...
Click to collapse
I understand it, but this didn't resolve my problem.

Metalor said:
I understand it, but this didn't resolve my problem.
Click to expand...
Click to collapse
I don't see that you have a problem. You said it works fine in LTE/GSM auto mode and you get LTE fine in that mode.
Metalor said:
When I set radio modem in LTE/GSM(auto) mode all is ok - phone registered and works in LTE network
Click to expand...
Click to collapse
For some reason you want to cripple your phone in "LTE only" mode so you can't make/receive any phone calls (mobile voice calls don't work on regular LTE, only on 3G bands) -- and you wouldn't have the option of dropping down to 3G even for data in poor LTE areas.
So, what problem do you have except for the one you're trying to create?

ChazzMatt said:
I don't see that you have a problem. You said it works fine in LTE/GSM auto mode and you get LTE fine in that mode.
Click to expand...
Click to collapse
I want to use "LTE only" mode when I share internet connection to my laptop, because my network carrier provide unlimited free LTE traffic, but limited 3G traffic.
I also use Huawei E3372h (USB-modem) in "LTE only" mode and it works OK, so why XT1254 can't work the same way.
In "LTE/GSM(auto)" mode XT1254 sometimes break LTE connection (about 2 hours continuous data stream) and switch to 3G, so I want to use LTE on force mode, as I use Huawei F3372h now.

Metalor said:
I want to use "LTE only" mode when I share internet connection to my laptop, because my network carrier provide unlimited free LTE traffic, but limited 3G traffic.
I also use Huawei E3372h (USB-modem) in "LTE only" mode and it works OK, so why XT1254 can't work the same way.
In "LTE/GSM(auto)" mode XT1254 sometimes break LTE connection (about 2 hours continuous data stream) and switch to 3G, so I want to use LTE on force mode, as I use Huawei F3372h now.
Click to expand...
Click to collapse
Your Huawei E3372h (USB-modem) works in "LTE only" mode for extended periods of time in the exact same locations as your phone? Is it the same carrier or a different carrier?
Because in LTE/GSM (auto) mode on your phone, you should get LTE if LTE is available. You will get lower (3G/2G) either when LTE is not available or IF your carrier is kicking you off for some reason (congestion or maybe some kind of time/data limit). In those instances that you are NOT getting LTE now on your phone, I don't think you would get LTE by being in an LTE-only mode. I think instead you would get just no data, since the phone would not be able to downgrade to 3G/2G.
I may be wrong, but that's my theory. However, if your Huawei E3372h (USB-modem) works in "LTE only" mode for extended periods of time in the exact same locations with the same carrier , then I don't know.

There is one thing you can try...
I'm that same menu, press the three dots on the top right>select umts bands>usa only.
For me personally, this limited me to lte, and i had to reflash everything to fix it. I think 950mhz (to name one) was still working so this may not even make a difference to you

ChazzMatt said:
Your Huawei E3372h (USB-modem) works in "LTE only" mode for extended periods of time in the exact same locations as your phone? Is it the same carrier or a different carrier?
I may be wrong, but that's my theory. However, if your Huawei E3372h (USB-modem) works in "LTE only" mode for extended periods of time in the exact same locations with the same carrier , then I don't know.
Click to expand...
Click to collapse
Yes, same location, same network carrier and even same phone number (2 sim-cards for same number).
Xeroman0 said:
There is one thing you can try...
I'm that same menu, press the three dots on the top right>select umts bands>usa only.
For me personally, this limited me to lte, and i had to reflash everything to fix it. I think 950mhz (to name one) was still working so this may not even make a difference to you
Click to expand...
Click to collapse
Thanks, but this not work for me.
I found solution:
"LTE only" mode works only with radio MDM9625_104651.11.05.17R from VRZ_XT1254_5.1.1_LCF23.80_CFC_SVC / quark_verizon-user_LCF23.80_release-keys_firmware_upgrade_SVC firmware.
Thanks to sl2208 user from 4pda.

Metalor said:
Yes, same location, same network carrier and even same phone number (2 sim-cards for same number).
Thanks, but this not work for me.
I found solution:
"LTE only" mode works only with radio MDM9625_104651.11.05.17R from VRZ_XT1254_5.1.1_LCF23.80_CFC_SVC / quark_verizon-user_LCF23.80_release-keys_firmware_upgrade_SVC firmware.
Thanks to sl2208 user from 4pda.
Click to expand...
Click to collapse
Interesting. So every update since that July 2015 XT1254 firmware upgrade breaks that mode on the XT1254? That firmware folder is not complete, by the way. Doesn't even have SUTL-49. But I assume you are probably on SUTL-49 already?
The dates in that folder are only upload dates, not release dates. The upload dates are up to a year off from actual release dates. And they also have XT1225 firmware in the "XT1254" folder, for some strange reason.
And I know it's from July 2015 because of this post:
20th July 2015, 04:10 AM
http://forum.xda-developers.com/showpost.php?p=61948709&postcount=202
Semseddin said:
Curious if anyone flashed this new file, quark_verizon-user_LCF23.80_release-keys_firmware_upgrade_SVC.xml.zip , Provided to community 2 days ago.
edit : just flashed onto a xt1254 with android 5.1 , it softbricked the device, couldn't flash most of the partitions. Downloading stock 5.1 fxz to unbrick, lets see.
Click to expand...
Click to collapse

I tried SUTL-44, SUTL-49 and
VRZ_XT1254_KDF21.128-15_15_CFC_SVC, nothing of these works with ""LTE only" mode. Then I asked on 4pda forum and user sl2208 tells me, that he tried all firmwares from this folder and only with LCF23.80 "LTE only" mode works.

this might be out of topic but kind a related ...
I'm using 1254 with 1225 stock India 6.0.1 ... I'm able to set LTE only and data working just fine (I'm using GSM Provider) so I dont consider this is some kind of problem before.
the problem for me is ... the default value is "LTE/GSM" ... and when there's call in ... it's drop to "E" not to any 3G network [H+/H/3G or umts]
is there any option to set it to "LTE/WCDMA/GSM" (might be from build.prop or else ... since there's no option like that in *#*#4636#*#* ...

3Dota said:
this might be out of topic but kind a related ...
I'm using 1254 with 1225 stock India 6.0.1 ... I'm able to set LTE only and data working just fine (I'm using GSM Provider) so I dont consider this is some kind of problem before.
the problem for me is ... the default value is "LTE/GSM" ... and when there's call in ... it's drop to "E" not to any 3G network [H+/H/3G or umts]
is there any option to set it to "LTE/WCDMA/GSM" (might be from build.prop or else ... since there's no option like that in *#*#4636#*#* ...
Click to expand...
Click to collapse
Hey is there any way to install official Android 6.1 in xt1254 Verizon ??

shoc.shukla said:
Hey is there any way to install official Android 6.1 in xt1254 Verizon ??
Click to expand...
Click to collapse
might be this Nov 25 ...

Sorry, had an answer but not exactly what your want.

shoc.shukla said:
Hey is there any way to install official Android 6.1 in xt1254 Verizon ??
Click to expand...
Click to collapse
There are two ways......
1... If your boot loader is locked you have to wait you might get official Verizon/Motorola version probably later this or at the next month...
2....If you are unlocked (boot loader )you can unlock the Boot loader and flash the 6.1 version.

Nido221 said:
There are two ways......
1... If your boot loader is locked you have to wait you might get official Verizon/Motorola version probably later this or at the next month...
2....If you are unlocked (boot loader )you can unlock the Boot loader and flash the 6.1 version.
Click to expand...
Click to collapse
Be better to unlock the bootloader and wait for people to upload copies to manually flash with unlocked bootloader.
If your bootloader is locked you will get the OTA, but your bootloader may remain locked down forever after that. Sunshine can't promise an exploit.
With unlocked bootloader you can have the official Verizon Marshmallow firmware AND do other stuff -- like root, install xposed, etc.

carrier aggregation in Europe

Hi,
This is an known fact that Xiaomi does not implement fully compatible carrier aggregation for European mobile networks.
In EU, users of mi 8, mi mix 2, redmi pro,... Reported they cannot use 4g+ due to impossible inter carrier aggregation combinations ( eg b3+b7).
Is mi 9 the first Xiaomi device that allows correct full 2CA or 3 CA for European market ?
Does somebody already test it ?
Is it still the same situation ? Which means we have no possibility to have fully working 4g+ outside China and India ?

On the EEA version, you've got at least 4G+ and 3CA.
Sorry for the big images, but it's not likely anyone else will reply anyway.
On those images, you can see up to 3CA on bands 1/7/20, 2CA on 1/7 or 7/20 or 3/7.
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I'm at a weak LTE location, but I won't really think about it in the middle of Paris.
Links if images don't work. Edit : XDA is so wrong I have to add a space.
https://ibb.co /YtgMFhm
https://ibb.co /gg6DDX6
https://ibb.co /wc2qCfB
https://ibb.co /D99wzzF
https://ibb.co /yy4v17x

Can confirm it works on the global rom as well in The Netherlands.

RedWave31 said:
On the EEA version, you've got at least 4G+ and 3CA.
Sorry for the big images, but it's not likely anyone else will reply anyway.
On those images, you can see up to 3CA on bands 1/7/20, 2CA on 1/7 or 7/20 or 3/7.
I'm at a weak LTE location, but I won't really think about it in the middle of Paris.
Links if images don't work. Edit : XDA is so wrong I have to add a space.
https://ibb.co /YtgMFhm
https://ibb.co /gg6DDX6
https://ibb.co /wc2qCfB
https://ibb.co /D99wzzF
https://ibb.co /yy4v17x
Click to expand...
Click to collapse
Can I ask what app you are using to test 2ca and 3ca. This looks handy and I am having an issue with getting LTE+. I have the Chinese variant, and am currently downloading the global rom to install on it and see if LTE+ starts working.

pimpmaneaton said:
Can I ask what app you are using to test 2ca and 3ca. This looks handy and I am having an issue with getting LTE+. I have the Chinese variant, and am currently downloading the global rom to install on it and see if LTE+ starts working.
Click to expand...
Click to collapse
Network Signal Guru, they're doing auto-promotion in the banner on top of each screenshot

RedWave31 said:
On the EEA version, you've got at least 4G+ and 3CA.
Sorry for the big images, but it's not likely anyone else will reply anyway.
On those images, you can see up to 3CA on bands 1/7/20, 2CA on 1/7 or 7/20 or 3/7.
I'm at a weak LTE location, but I won't really think about it in the middle of Paris.
Links if images don't work. Edit : XDA is so wrong I have to add a space.
https://ibb.co /YtgMFhm
https://ibb.co /gg6DDX6
https://ibb.co /wc2qCfB
https://ibb.co /D99wzzF
https://ibb.co /yy4v17x
Click to expand...
Click to collapse
Thank you for your answer.
So, can we assume the mi 9 is the first Xiaomi device fully operational in EU ?
Xiaomi has always been shady (to say the least) concerning Carrier Aggregation.

SKiLLa XP said:
Can confirm it works on the global rom as well in The Netherlands.
Click to expand...
Click to collapse
Did you have the possibility to check if the mi 9 can correctly aggregate b3/b7 and b3/b20?
I'm from Belgium and the 3 operators use mostly b3/b20 and sometimes b3/b7. It should be very similar in Netherlands.

Mastamike said:
Did you have the possibility to check if the mi 9 can correctly aggregate b3/b7 and b3/b20?
I'm from Belgium and the 3 operators use mostly b3/b20 and sometimes b3/b7. It should be very similar in Netherlands.
Click to expand...
Click to collapse
I still have to wait another 100+ hour for my unlock, so I cannot show you the details (need root), but I'm pretty sure the 3ca is working, as I got my carrier's full 225 Mbps speed at some locations (as in: real-life performance) including the 4G+ and VoLTE icons too.
EDIT: 225Mbps could still be 2CA technically, so I dug a bit deeper into the (official Dutch) specs:
4G: LTE FDD: B1 / 2/3/4/5/7/8/12/20/28; LTE TDD: B38 / B39 / B40
3G: WCDMA: B1 / B2 / B4 / B5 / B8; TDSCDMA: B34 / B39; CDMA EVDO BC0
2G: GSM: B2 / B3 / B5 / B8; CDMA 1X: BC0
And 4x4 MIMO | HPUE | HO RxD
Please also note that I do still need to do the *#*#4636#*#* trick to set the modem to LTE/WCDMA on each reboot to prevent Cell Standby drain and reception issues on my official global ROM (10.2.9.0); can't wait for the unlock waiting-period to be over ...
PS: I believe the Cell Drain to be caused (at least partially) by not only searching for those unused frequencies in Europe by default, but also when it actually finds a working legacy 2G or 3G frequency, it desperately tries to keep that connection alive in standby-/sleep-modus instead of using higher speed 3G and 4G frequencies to try & save battery, but because legacy frequency towers are very sparse and far between in my country (they're even talking about killing 3G off in a few years already), it actually drains the battery way more than simply using that stellar 4G signal from the brandnew tower just a few hundred meters away.

SKiLLa XP said:
Please also note that I do still need to do the *#*#4636#*#* trick to set the modem to LTE/WCDMA on each reboot .
Click to expand...
Click to collapse
There is an old application called 4G LTE Switch that does this number for you and is very lightweight. You can also set a contact tho.
It still doesn't force LTE on reboot, I don't know ANY application that does this. And you shouldn't, because sometimes, rebooting a phone in a car while driving because you have an urgent call to make in a 2G environment and GSM won't activate is enough distraction.

SKiLLa XP said:
I still have to wait another 100+ hour for my unlock, so I cannot show you the details (need root), but I'm pretty sure the 3ca is working, as I got my carrier's full 225 Mbps speed at some locations (as in: real-life performance) including the 4G+ and VoLTE icons too.
EDIT: 225Mbps could still be 2CA technically, so I dug a bit deeper into the (official Dutch) specs:
4G: LTE FDD: B1 / 2/3/4/5/7/8/12/20/28; LTE TDD: B38 / B39 / B40
3G: WCDMA: B1 / B2 / B4 / B5 / B8; TDSCDMA: B34 / B39; CDMA EVDO BC0
2G: GSM: B2 / B3 / B5 / B8; CDMA 1X: BC0
And 4x4 MIMO | HPUE | HO RxD
Please also note that I do still need to do the *#*#4636#*#* trick to set the modem to LTE/WCDMA on each reboot to prevent Cell Standby drain and reception issues on my official global ROM (10.2.9.0); can't wait for the unlock waiting-period to be over ...
PS: I believe the Cell Drain to be caused (at least partially) by not only searching for those unused frequencies in Europe by default, but also when it actually finds a working legacy 2G or 3G frequency, it desperately tries to keep that connection alive in standby-/sleep-modus instead of using higher speed 3G and 4G frequencies to try & save battery, but because legacy frequency towers are very sparse and far between in my country (they're even talking about killing 3G off in a few years already), it actually drains the battery way more than simply using that stellar 4G signal from the brandnew tower just a few hundred meters away.
Click to expand...
Click to collapse
It's a shame and quite disrespectful for European consumers that Xiaomi does not configure and set the mobile properly according to the country they are selling.
Even if you dig the internet, there are no datas nor proofs that mi 9 can correctly aggregate carriers outside China.
And as all predecessors were unable to do it, we have to rely on good willing people here on XDA.

I can confirm that mi 9 is the first phone from xiaomi that support 4.5G in my country (b3+b7)

RedWave31 said:
There is an old application called 4G LTE Switch that does this number for you and is very lightweight. You can also set a contact tho.
It still doesn't force LTE on reboot, I don't know ANY application that does this. And you shouldn't, because sometimes, rebooting a phone in a car while driving because you have an urgent call to make in a 2G environment and GSM won't activate is enough distraction.
Click to expand...
Click to collapse
You can also click one of the menu's in the About Device screen (kinda like Developer Tools) as well to access the menu, or use the MiAppa app (which even gives access to some ROM settings that are still fully in Chinese). I did add it as a contact too, but dialing the contact with the built-in dialer doesn't work and by now I can dream that number anyway I noticed more system-related settings the MIUI ROM resets/overrides when rebooting.

I can confirm too. It works fine

emprazol said:
I can confirm that mi 9 is the first phone from xiaomi that support 4.5G in my country (b3+b7)
Click to expand...
Click to collapse
4Freedom said:
I can confirm too. It works fine
Click to expand...
Click to collapse
Thank you but can you tell us which country are you from ?
And were you able to verify (network signal guru or other with root) if you were able to aggregate b3/b20 and b3/7; or even 3 CA b3/b7/b20 ?
(Like Pimpmaneaton and Skilla xp)

I am interested in a 8gb version but its not the global version, have been speaking to this Chinese ebay seller he says he's gonna unlock the bootloader flash a global rom on it and than it will be compatible with UK networks for 4g LTE use, the 6gb ram global is compatible I have used it, works perfect, my question is will the 8gb Chinese be able to work like global 6gb version after the global rom flash? thanks in advance guys, cheers.

LG V40 keeps dropping cellular and wifi connection

LG V40 keeps dropping cellular and wifi connection.. When ever I am connected to Wi-Fi data both the Wi-Fi and cellular network keeps dropping connection. If the phone is connected only by data network. it works fine. Have to put it on airplane mode then put on the Wi-Fi to work. This issues only happens with certain Sims. With others works great. The sims are not the issue because the sims were tested on other devices

A few things to check:
1) Make sure you have data roaming turned off.
2) In Wi-Fi settings, disable 'Auto connect Automatically connect to an available AT&T Wi-Fi HotSpot' (this applies to AT&T Rom only, disregard if you have cross-flashed).
3) In Wi-Fi settings, tap on three dots, and go into advanced settings and make sure 'Aggressive Mode' is not enabled.
4) In Developer Options, make sure 'Aggressive Wi-Fi to Cellular handover' is disabled.
5) In Developer Options, make sure 'Cellular data always active' is enabled.
6) In Network & Internet settings, go into 'Data Manager', make sure 'Limit mobile data usage' is disabled. Also, in same menu click on three dots and select option 'Restrict networks' just to check you don't have any Wi-Fi connections restricted.
7) There is a setting to 'avoid weak Wi-Fi signals', which in combination with bad cellular signal at your location could also be causing this problem. I just can't find this setting in Oreo (or perhaps it is reworded into one of the above), if you are on Pie, it might be there somewhere, look for it and disabled it if you find it.
8) If nothing above helps, consider resetting your network settings in same menu where you do factory reset.
Other than that, may be someone else can help further but I am pretty sure they'd wanna know if you're on Oreo or Pie. What your native hardware model is, and if you cross-flashed, which carrier KDZ you are on.
Edit: Also, was the phone ever opened to replace battery or do repairs? Wi-Fi and Cellular antennas are pretty much stickers that clasp on and go around between battery and back panel and sometimes after repairs they are not put back on properly and can result in weak signals.

Facing same issue on my indian lg v405ebw with vodafone sim when wifi is in use sim network often goes out and only turning airplane mode on off or restarting phone gets the network back.
If wifi is turned off no issue in network reception.
Vodafone Sim works fine in other phones and other networks work fine in v40 too.
Running latest android 9 march security patch firmware version 20d ind

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Lg v40
This is my settings

Am from the Caribbean. We have 3 network providers. It works perfect with digicel, but looses the signal with flow and inet. Could it be the network band. Inte and flow have the same network band. But digicel is different. What network band is carrier?

Wow
ohhuzoor said:
Facing same issue on my indian lg v405ebw with vodafone sim when wifi is in use sim network often goes out and only turning airplane mode on off or restarting phone gets the network back.
If wifi is turned off no issue in network reception.
Vodafone Sim works fine in other phones and other networks work fine in v40 too.
Running latest android 9 march security patch firmware version 20d ind
Click to expand...
Click to collapse
Am from the Caribbean. We have 3 network providers. It works perfect with digicel, but looses the signal with flow and inet. Could it be the network band. Inte and flow have the same network band. But digicel is different. What network band is carrier?

ohhuzoor said:
Facing same issue on my indian lg v405ebw with vodafone sim when wifi is in use sim network often goes out and only turning airplane mode on off or restarting phone gets the network back.
If wifi is turned off no issue in network reception.
Vodafone Sim works fine in other phones and other networks work fine in v40 too.
Running latest android 9 march security patch firmware version 20d ind
Click to expand...
Click to collapse
Settings
Mobile network
Network mode
Gsm/wcdma auto and error fixed

warmachine20 said:
Settings
Mobile network
Network mode
Gsm/wcdma auto and error fixed
Click to expand...
Click to collapse
Yeah, no point in having LTE enabled in the Caribbean. I used Lime and Digicel on T-Mobile and Verizon phones when I was living in Grenada for a while. You are right, phone bands need to be compatible with the carrier bands but in this case I think some of the bands might be software locked too. For compatible bands check on this website, for example Lime and Digicel bands for Grenada: https://www.frequencycheck.com/countries/grenada
Also, i think by default LG V40 do not have all the bands enabled, they get region locked depending on which region KDZ you are using. Depending on which KDZ you cross-flashed to, you can verify which of the bands that are enabled in the hidden menu. I did not have band selection sub-menu on my AT&T LG V40 and not sure if you will have this menu in your phone or not but doesn't hurt to check. Just be careful not to change any settings in hidden menu that you don't know about, you can really mess up your phone if start toggling random settings. You can dial *#546368#*405# in your dialer and go in 'Field Test' then 'Modem Settings' then 'LTE Band Selection' and can try enable all bands. Depending on which carrier phone you have, you may not have these options available in hidden menu as my phone didn't have these (until i cross-flash).