Database Develop

Is this the infamous Nexus 3G problem?

before I got my phone I read about all the 3G problems people were having.
when I first got my nexus, there were no issues at all. no dropped service or connection.
I'm in a 3G area (looked at tmobile coverage map) and I see no reason for this to be happening.
my phone will show that I have 3G connection (UMTS) but when trying to use anything that requires a connection, it fails.
on the other hand, HSDPA network works fine and so does EDGE.
I got my phone over a month ago and this hasn't started happening until recently.
I'm always on EDGE network now and if I'm not on EDGE, I have to be on HSDPA in order for me a to send messages or use data connection.
UMTS is broken and does not give connection. I want to call HTC and see if they can replace it but I don't think they'd do it.
anyone else have the 3G problem? I'm sure a lot do, but is it only with UMTS?

This is not the "3g issue" everyone talks about. This sounds like you are either having network issues in your area, or did you flash a new ROM to your phone recently?

RogerPodacter said:
This is not the "3g issue" everyone talks about. This sounds like you are either having network issues in your area, or did you flash a new ROM to your phone recently?
Click to expand...
Click to collapse
I had been on a CM test build and hadn't flashed a rom in a long time.
network issues isn't the problem because my friends G1 yesterday had 3G and I had EDGE.
I don't think it's my SIM card either, not even two years old.
I'm tempted to call HTC because this happened out of nowhere after a good month of no problems.

99% of the time it's a carrier issue.
When the number of users on a carrier grows or jumps on the carrier, the tower signal shrinks it's radius. And if you're in two competing tower areas, then your signal might drop/fluctuate because the phone is swapping between them.
Nothing the phone can do about it. It's probably your carrier issue.

how can that be when my friends right next to me have full bars and 3G while I'm on edge?
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dudebro said:
how can that be when my friends right next to me have full bars and 3G while I'm on edge?
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Sent via the XDA Tapatalk App
Click to expand...
Click to collapse
Change your settings to WCDMA only then.

I've tried and all I get is no connection or occasionally hsdpa.
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Sent via the XDA Tapatalk App

I have experienced something like this. I am unrooted and few weeks after having the phone I would see a 3g symbol but be unable to access any data. It has been very frustrating once but generally it kicks in again with a reboot.
A similar issue since installing froyo is that the stock browser wouldn't connect. Other browsers and applications could access data but the stock browser couldn't. It started again later but I now use xscope.
I love android but I hope that the continue to work on its stability because it could be improved

benjatt said:
I have experienced something like this. I am unrooted and few weeks after having the phone I would see a 3g symbol but be unable to access any data. It has been very frustrating once but generally it kicks in again with a reboot.
A similar issue since installing froyo is that the stock browser wouldn't connect. Other browsers and applications could access data but the stock browser couldn't. It started again later but I now use xscope.
I love android but I hope that the continue to work on its stability because it could be improved
Click to expand...
Click to collapse
so is your 3G working now? I'm just going to call HTC and see what happens.
I've tried WCDMA only, flashing a radio, and anything I can find on the web but no luck.

dudebro said:
so is your 3G working now? I'm just going to call HTC and see what happens.
I've tried WCDMA only, flashing a radio, and anything I can find on the web but no luck.
Click to expand...
Click to collapse
Have you tried modifying your build.prop? If not, do a quick search and see if modifying it helps...

chowlala said:
Have you tried modifying your build.prop? If not, do a quick search and see if modifying it helps...
Click to expand...
Click to collapse
what should I search for? I'm not familiar with modding the build.prop.

No 3G since FRF83

Any solution?
Only GPRS/EDGE does work, if 3G is available, it disconnects automatically until 3G isn't available.
Solution: Set to 2G-Only :-(
Anyone has the same problem?
I didn't have this problem with FRF 72.
Provider: Sunrise Switzerland
Radio: 32.36.00.28U_4.06.00.12_7

Have you tried going into your phone settings from *#*#4636#*#* and setting it to wcdma only? I did that on mine not too long ago and no more dropping to edge for me!
-------------------------------------
Sent via the XDA Tapatalk App

andi86 said:
Any solution?
Only GPRS/EDGE does work, if 3G is available, it disconnects automatically until 3G isn't available.
Solution: Set to 2G-Only :-(
Anyone has the same problem?
I didn't have this problem with FRF 72.
Provider: Sunrise Switzerland
Radio: 32.36.00.28U_4.06.00.12_7
Click to expand...
Click to collapse
does it lose complete signal? or does it show 3g still but just not doing anything?
Mine was working at first after flash. Then at about 2am it just kept trying to load then times out. Still shows 3g but just dont do anything. Im hoping its just tmobile messing with their towers... I dont see why it would work at first then not now..

The problem is, that i can only have a internet connection, when the phone is logged in into a gsm or edge network.
as soon as wcdma is available, the phone disconnects from the internet.

the signal is always available, but it looses the internet connection when it changes to 3G mode.
when the phone changes from 2G->3G mode, i see for 1s the 3G icon and then no icon will bi there.
when it changes back from 3G->2G, the EDGE/GPRS icon is visible again.

andi86 said:
the signal is always available, but it looses the internet connection when it changes to 3G mode.
when the phone changes from 2G->3G mode, i see for 1s the 3G icon and then no icon will bi there.
when it changes back from 3G->2G, the EDGE/GPRS icon is visible again.
Click to expand...
Click to collapse
ok thanks for clarification. My problem is different. I think related to phone company.. I still show the 3g signal and even have bars, but the pages dont load and eventually gives me the check your service and try again alert....
So Im hoping soon its working again for me... And I hope you as well figure it out.....

Thank you Good luck!

Had the same issue after update, did *#*#4636#*#* and noticed I was set to GSM only. Set it to WCDMA preferred and now it's good.

Thank you very much, thats the solution!!
Andi
ezhangin said:
Had the same issue after update, did *#*#4636#*#* and noticed I was set to GSM only. Set it to WCDMA preferred and now it's good.
Click to expand...
Click to collapse
Sent from my Nexus One using XDA App

ezhangin said:
Had the same issue after update, did *#*#4636#*#* and noticed I was set to GSM only. Set it to WCDMA preferred and now it's good.
Click to expand...
Click to collapse
Thank you. Updated to FRF83 this morning and I've had a full 3g signal, just couldn't pull data all day. Could over edge. Sure enough, GSM only was selected.
AT&T N1.

I'm having the same issue on a non-rooted phone on T-Mobile. No 3G after the FRF83 update. Full bars of service and 3G displayed in the status bar. Dropping to Edge only works but there is no data with 3G.

Lost Dog said:
I'm having the same issue on a non-rooted phone on T-Mobile. No 3G after the FRF83 update. Full bars of service and 3G displayed in the status bar. Dropping to Edge only works but there is no data with 3G.
Click to expand...
Click to collapse
Same issue here.
Switching to WCDMA preferred doesn't work for me though.....any help is welcome

I think it's a hardware problem with a lot of N1's.
Mine was ok the first 2 months, and later, 3g not working. This is driving me crazy ):
I have tried everything. Change the simcard, I did a reset of the data with my telcon, and nothing happens.
I've seen these problems on many N1's.
I hope google / htc release a fix for this problem.

Lost Dog said:
I'm having the same issue on a non-rooted phone on T-Mobile. No 3G after the FRF83 update. Full bars of service and 3G displayed in the status bar. Dropping to Edge only works but there is no data with 3G.
Click to expand...
Click to collapse
how bout checking your bands in the service menu. so *#*#4636#*#* -> phone info -> press the menu key for more options -> select bands -> choose one appropriate for your region (ie "USA BANDS").
If all else fails do a factory reset by going to the settings -> privacy -> restore factory defaults.. of course do a backup/sync/whatever before just to make sure you can get all your apps back.
There's other ways to do a factory reset via the bootloader .. its under recovery and you press up volume or the trackball I think and you can just select all the clear/erase settings there and that should clear out everything on the phone's internal storage.
The factory reset worked for me (via bootloader) when I upped from update-1 to FRF50 and didn't have any data icon next to my signal strength. Could call out but couldn't get data.
Hope that helps.

jasonpich said:
I think it's a hardware problem with a lot of N1's.
Mine was ok the first 2 months, and later, 3g not working. This is driving me crazy ):
I have tried everything. Change the simcard, I did a reset of the data with my telcon, and nothing happens.
I've seen these problems on many N1's.
I hope google / htc release a fix for this problem.
Click to expand...
Click to collapse
Check your APN settings. Do a full factory reset from the bootloader. If nothing works you should call tech support again. Most 3g issues where you have issues with connecting are service/signal level related. I *****ed early about my 3g issues on tmobile and it was the network as they've pretty much gone away with improving the backhaul in my area for HSDPA+ or updates to the phone's radio.
HTC is really really really cool about swapping phones and repairing them. If you feel you have a nexus that has hardware issues call them. I did this 3 times already (one time for minor cosmetic issues with the refurb they sent) and I couldn't be happier about how willing they were to replace/repair the phone. It turns out I really didn't have any issues with them at all.. with any issues with hardware from the second refurbished phone. It was service or software related and I'm happy to say with updates/tmobile service improvements I couldn't be happier with this phone.

blisk said:
Check your APN settings. Do a full factory reset from the bootloader. If nothing works you should call tech support again. Most 3g issues where you have issues with connecting are service/signal level related. I *****ed early about my 3g issues on tmobile and it was the network as they've pretty much gone away with improving the backhaul in my area for HSDPA+ or updates to the phone's radio.
HTC is really really really cool about swapping phones and repairing them. If you feel you have a nexus that has hardware issues call them. I did this 3 times already (one time for minor cosmetic issues with the refurb they sent) and I couldn't be happier about how willing they were to replace/repair the phone. It turns out I really didn't have any issues with them at all.. with any issues with hardware from the second refurbished phone. It was service or software related and I'm happy to say with updates/tmobile service improvements I couldn't be happier with this phone.
Click to expand...
Click to collapse
Thanks blisk, but the thing I don't understand is why Blackberry 9700 with T-Mobile bands, doesn't have problems at all ?
By the way, I rooted my phone , so the thing with the warranty it's complicated

I had it happen last night at work all night, but when i got home i checked my wife's tp2 and it also was doing the same thing so for levity wasn't the phone but tmobile. They started worming the same time also.... I think its tmobile.

Hello, I had the same problem with my imported n1. I'm using the tmobile version non rooted fully stock manually updated to frf83. I did a *#*#4636#*#* and selected wcdma only, rebooted and couldn't connect to my gsm network. Went in again and did a wcdma preferred, rebooted, and I works better, still changes fast to edge and G, but less often, I'm still trying it but I have high hopes its gonna be ok

Mmmm i did have problems with 3G too after pushing FRF83, but i found out that for some reason the APN settings weren't set correctly after the update. In my case the port setting after the proxy of the APN wasn't set, i changed to the correct value and it worked.
In conclusion, check your APN settings.

Just went from FRF72 to FRF83 and it's working fine.
I'm currently set to GSM auto (PRL) in the *#*#4636#*#* and I didn't change it to that after putting on FRF83.

Lte issue on usa version

Hi guys!
Im having this issue. *#*#4636#*#* when i dial this code it let me access to select what type of network i want. So i want to force to use LTE Only, but the signal get lost, not signal anymore. But when i change it to lte/gsm its works again. I know i have lte in the area but i cant get it in that way. Can anyone ccan try that and reports back if let u chanche the network? Thanks.
Sent from my Nexus 6 using XDA Free mobile app

Bestplayer55 said:
Hi guys!
Im having this issue. *#*#4636#*#* when i dial this code it let me access to select what type of network i want. So i want to force to use LTE Only, but the signal get lost, not signal anymore. But when i change it to lte/gsm its works again. I know i have lte in the area but i cant get it in that way. Can anyone ccan try that and reports back if let u chanche the network? Thanks.
Sent from my Nexus 6 using XDA Free mobile app
Click to expand...
Click to collapse
i change my networks all the time, without issue. if i put lte only, i get lte only. but cant make phone calls on it, so i use lte/gsm. if you dont have an lte signal, it will not connect to lte only.

simms22 said:
i change my networks all the time, without issue. if i put lte only, i get lte only. but cant make phone calls on it, so i use lte/gsm. if you dont have an lte signal, it will not connect to lte only.
Click to expand...
Click to collapse
Thanks.. But u get data working on lte only???
Sent from my Nexus 6 using XDA Free mobile app

Bestplayer55 said:
Thanks.. But u get data working on lte only???
Sent from my Nexus 6 using XDA Free mobile app
Click to expand...
Click to collapse
yup, no issues. tmobile here.

simms22 said:
yup, no issues. tmobile here.
Click to expand...
Click to collapse
Im on claro puerto rico. Ure version is 5.0.1?
Sent from my Nexus 6 using XDA Free mobile app

Bestplayer55 said:
Im on claro puerto rico. Ure version is 5.0.1?
Sent from my Nexus 6 using XDA Free mobile app
Click to expand...
Click to collapse
no, im on 5.0.2, but that wont make any difference.

I have an issue where my Nexus 6 will boot with LTE, but once it looses from getting/making a call it cannot regain it.

TopHATTwaffle said:
I have an issue where my Nexus 6 will boot with LTE, but once it looses from getting/making a call it cannot regain it.
Click to expand...
Click to collapse
Which company ?
Sent from my Nexus 6 using XDA Free mobile app

Bestplayer55 said:
Which company ?
Sent from my Nexus 6 using XDA Free mobile app
Click to expand...
Click to collapse
T-Mobile. Let the device sit overnight and it got LTE back. So it seems either the LTE radio in this device is terrible compared to my Note 3, or it just won't attempt to get back onto LTE all that often. Or my Devices LTE radio is messed up.

TopHATTwaffle said:
T-Mobile. Let the device sit overnight and it got LTE back. So it seems either the LTE radio in this device is terrible compared to my Note 3, or it just won't attempt to get back onto LTE all that often. Or my Devices LTE radio is messed up.
Click to expand...
Click to collapse
Telus Canada. XT1103.
Mine would stay on H+ after a call for a long time. I sometimes "force" it to connect to LTE by toggling cellular data and off in settings. Or a reboot.
Have tried the *#*#4636#*#* menu to change to "LTE only", but won't even connect to LTE in this case.
This feels like a software issue. Clearly it's not a network or hardware issue, since it can connect to LTE.

aa_chow said:
Telus Canada. XT1103.
Mine would stay on H+ after a call for a long time. I sometimes "force" it to connect to LTE by toggling cellular data and off in settings. Or a reboot.
Have tried the *#*#4636#*#* menu to change to "LTE only", but won't even connect to LTE in this case.
This feels like a software issue. Clearly it's not a network or hardware issue, since it can connect to LTE.
Click to expand...
Click to collapse
if its not connecting to lte when you set it to lte only, then you either dont have lte around when you set it or its an extremely weak signal.

aa_chow said:
Telus Canada. XT1103.
Mine would stay on H+ after a call for a long time. I sometimes "force" it to connect to LTE by toggling cellular data and off in settings. Or a reboot.
Have tried the *#*#4636#*#* menu to change to "LTE only", but won't even connect to LTE in this case.
This feels like a software issue. Clearly it's not a network or hardware issue, since it can connect to LTE.
Click to expand...
Click to collapse
Unfortunately, it depends a lot on where you are. The office building that I am in is very bad for LTE, signal at my desk is -100dbm, if I go outside it switches up to around -60 to -70dbm. If I choose 3G as the preferred network, sitting in exactly the same location the signal goes to -75dbm 19 au. If I am at my apartment, the LTE signal is much stronger there. This of course effects the battery life also. I am not sure if there is a way to default which LTE band is used since I think Telus only uses band 4 for LTE but I am not familiar with how the phone determines which band to use or if it keeps scanning all of them.

simms22 said:
if its not connecting to lte when you set it to lte only, then you either dont have lte around when you set it or its an extremely weak signal.
Click to expand...
Click to collapse
No, where I was testing it, LTE was strong. I also had a Nexus 5 right beside it, and it had no problem acquiring a full signal.
With the Nexus 6, after a reboot or the data toggle, it acquired LTE, again almost full signal.

So I decided to just leave it alone and use it as normal without worrying about LTE or H+. I did not toggle data or reboot, just leave it as is. I just observe. After a few days, it seems better in that it will be connect to LTE a short while after a call, and behaves like how I expected it to like on the Nexus 5.
Of course, immediately after a call, it will stay on H+. If I really wanted LTE right then, I just toggle the data on/off from settings (not by setting to "LTE only" in *#*#4636#*#* menu).

aa_chow said:
So I decided to just leave it alone and use it as normal without worrying about LTE or H+. I did not toggle data or reboot, just leave it as is. I just observe. After a few days, it seems better in that it will be connect to LTE a short while after a call, and behaves like how I expected it to like on the Nexus 5.
Of course, immediately after a call, it will stay on H+. If I really wanted LTE right then, I just toggle the data on/off from settings (not by setting to "LTE only" in *#*#4636#*#* menu).
Click to expand...
Click to collapse
Ugghh lte data is hardly showing now went into dialer typed in code...it wont let lte only stick when i reboot is goes back to lte/gsm (auto)? Im on tmobile
Btw whats usa band? Thanks

Mi5 lte issue with all roms

Hello Fellow MI5 Users,
I am writing this thread to see if anyone else is having issues like me with my Mi5.
The problem is the intermittent signal issue with LTE, My problem started when I flashed 6.7.28 miui 8 update at first I thought that it was my Network Provider, but when I checked my dad's and sisters phones (same provider) their 4G signal is very stable without any issues at all.
So to describe my problem this is what's happening to my phone.
My phone is now running the latest Global beta miui8 6.8.12
When switching to LTE as prefer connection my phone signal goes crazy from NO SIGNAL - NO SERVICE - EMERGENCY ONLY - NO SIMCARD as I dig in to my settings i change my preferred connection to 3G Only which in my surprise works well and perfect without any issues but the problem here in my country(Philippines) you cannot rely on H or H+ at all since the network provider service sucks bigtime!
So far here's a list of what I did with my phone to fix it
- Flash back to China miui8 later version that I remembered that I don't have any issues with my LTE(Sucks because the issue was there also when I went back)
- Flash to MIUI 7 (Ohh well at this point I thought going back to miui7 will fix this issue but NO, not at all and I'm losing patience)
- Flash all KINDS of CM Based OS (Well switching OS might solve the issue, But believe me it got worst! after flashing all kinds of CM Based OS on my MI5 it all went down to Reboot forever bug (this happens when my phone boots and phone started to connect to LTE)
- Went back to Global beta miui 8 6.8.12 basedband version TH20c1.9-00038 up until now im still using this version.
----SHOUTOUT SA MGA KAPWA KO PINOY!
James Manaois Cruzat

I have also problem,cant get lte on my device max i get is H+,bought phone 2 weeks ago and i use global stable rom.

chaotico said:
I have also problem,cant get lte on my device max i get is H+,bought phone 2 weeks ago and i use global stable rom.
Click to expand...
Click to collapse
Could it be you're own carrier hasn't got coveridge for LTE for your device?
Sent from my MI 5 using XDA Premium HD app

In my country lte is Band 3(1800) and mi5 should support that band,right?

marcel112 said:
Could it be you're own carrier hasn't got coveridge for LTE for your device?
Sent from my MI 5 using XDA Premium HD app
Click to expand...
Click to collapse
For me my carrier do support coverage for MI5, but just recently it went nuts

hi im using official global rom with my mi5 but i cant make native video call on my gsm operotor because of not support miui 7 and 8 so.. is there a rom support native video calling like samsung ?

Mi5 Prime user here. same problem with LTE as well using GLOBE sim, no problem with SMART so far. using China ROM MIUI 8
here are my observations
GLOBE switched to LTE - stable when stationary.. goes NO SIGNAL / EMERGENCY CALLS ONLY when moving in a vehicle
i guess there is a problem on the radio signal switching from H+ to LTE vise versa. unlike my other phone - Meizu M2 Note. no problem switching between 3G / H+ / 4G.

xantrium said:
Mi5 Prime user here. same problem with LTE as well using GLOBE sim, no problem with SMART so far. using China ROM MIUI 8
here are my observations
GLOBE switched to LTE - stable when stationary.. goes NO SIGNAL / EMERGENCY CALLS ONLY when moving in a vehicle
i guess there is a problem on the radio signal switching from H+ to LTE vise versa. unlike my other phone - Meizu M2 Note. no problem switching between 3G / H+ / 4G.
Click to expand...
Click to collapse
Sucks right? I wanted to switch carrier as well but then again, LTE coverage with smart sucks specially in my location... Hoping that this will be fix soon..
I used to have a perfect LTE with globe 4G+ after some time after updating OS version it went nuts

Deleted

I updated my mi5 to miui 8 global and got 4g signal but only for a minute or less then it dissapeared and when i manually choose mobile networks i can only select Telenor 2g and 3g...really weird.

Thread Closed - Issue Fixed ---- JMC
Sent from my MI 5 using XDA-Developers mobile app

Same Globe Sim Issue
jamiepotter said:
Hello Fellow MI5 Users,
I am writing this thread to see if anyone else is having issues like me with my Mi5.
The problem is the intermittent signal issue with LTE, My problem started when I flashed 6.7.28 miui 8 update at first I thought that it was my Network Provider, but when I checked my dad's and sisters phones (same provider) their 4G signal is very stable without any issues at all.
So to describe my problem this is what's happening to my phone.
My phone is now running the latest Global beta miui8 6.8.12
When switching to LTE as prefer connection my phone signal goes crazy from NO SIGNAL - NO SERVICE - EMERGENCY ONLY - NO SIMCARD as I dig in to my settings i change my preferred connection to 3G Only which in my surprise works well and perfect without any issues but the problem here in my country(Philippines) you cannot rely on H or H+ at all since the network provider service sucks bigtime!
So far here's a list of what I did with my phone to fix it
- Flash back to China miui8 later version that I remembered that I don't have any issues with my LTE(Sucks because the issue was there also when I went back)
- Flash to MIUI 7 (Ohh well at this point I thought going back to miui7 will fix this issue but NO, not at all and I'm losing patience)
- Flash all KINDS of CM Based OS (Well switching OS might solve the issue, But believe me it got worst! after flashing all kinds of CM Based OS on my MI5 it all went down to Reboot forever bug (this happens when my phone boots and phone started to connect to LTE)
- Went back to Global beta miui 8 6.8.12 basedband version TH20c1.9-00038 up until now im still using this version.
----SHOUTOUT SA MGA KAPWA KO PINOY!
James Manaois Cruzat
Click to expand...
Click to collapse
Hello James,
I am having the exact same issue on my Globe Sim. I just bought mine last week. Whenever i turn on my mobile data, signal suddenly goes to no service, not detected, etc. Its very frustruating.
Is my unit defective? Or is it just a firmware issue?

jamiepotter said:
Thread Closed - Issue Fixed ---- JMC
Sent from my MI 5 using XDA-Developers mobile app
Click to expand...
Click to collapse
How to fix it?

jamiepotter said:
Thread Closed - Issue Fixed ---- JMC
Sent from my MI 5 using XDA-Developers mobile app
Click to expand...
Click to collapse
how to fix?

jamiepotter said:
Sucks right? I wanted to switch carrier as well but then again, LTE coverage with smart sucks specially in my location... Hoping that this will be fix soon..
I used to have a perfect LTE with globe 4G+ after some time after updating OS version it went nuts
Click to expand...
Click to collapse
I am using both Mi5 and Redmi Note 4x. In both phones, I experience frequent network connection drops for both SIM cards in serted on the phone (one is Sun, the other is Globe). Even while stationary, I exeperience the network drop where the signal bar for both SIMs suddenly simultaneously disappear. The network drop is worse when I am mobile. In addition, the network drop is causing the app I am using at the time to restart. PLEASE HELP.

hi.. is this thread still active? have you found the solution?
i am also from the Philippines, been using globe for 2 years in mi5 with no connection problems, then recently, when i try to connect to data, the signal goes on and off just like yours.. just this month, i updated from miui7 to miui9 and the problem got worst! when i connect to mobile data, phone reboots after a minute! i tried every fix i found in the internet (reset APN settings, factory reset, airplane mode) but nothing seems working.. So i tried Sun as my other network and it works perfectly fine.. Also, i tried to interchange sim 1 and 2 slot but still not fixed.. Another thing, when i turn the data in different place, my connection seems okay.. i live in cebu city but works in lapulapu.. the problem occurs in lapulapu..
help! is this network related or somethings wrong with the phone?

Good to see this thread. I thought my phone had a factory defect.
based on my experience.
version 9.1.1.0 and below only loses signal for globe while on data connection in some locations .
higher versions up to the latest(now is 9.5.5.0) causes our phone to totally reboot in some locations as well.
maybe it has to do with the signal/radio frequency on the area for the identified carrier(Globe).

this is easy.
root then disable LTE band 41

beastfren said:
this is easy.
root then disable LTE band 41
Click to expand...
Click to collapse
How do you disable band 41?
Thank you in advance.

easy way > install network signal guru > 3 dots (menu) > lock bands > lte > uncheck b41 tdd 2500.

Cell signal keeps reverting to 3G

Hi,
So I'm having an issue keeping an LTE signal. I use straight talk with at&t and I can get LTE if I turn the radio on/off, but it will always switch itself over to 3G at some point in the same location. There are apps that can force it to do LTE only which works, but I can't make or receive voice calls over LTE.
Does anyone know how to fix this? This never happened on other phones on the same network. In my specific location I get 2-3 bars of LTE and 4 bars if switched to 3G. I guess it wants to keep using the better signal.

Also at home where I have full signal LTE and H+, it will choose H+ over LTE.

Had same problem. Switched sim slot to the other. 4g again. Try IT?

Did you try different APN settings? I'm guessing you already checked the preferred network option.
Sent from my MIX using Tapatalk

APN settings are good and I can get LTE if I flip the radio on and off...it just always wants to revert back to 3G at some point. Same thing happens in sim card slot 1 or 2

pacattack81 said:
Hi,
So I'm having an issue keeping an LTE signal. I use straight talk with at&t and I can get LTE if I turn the radio on/off, but it will always switch itself over to 3G at some point in the same location. There are apps that can force it to do LTE only which works, but I can't make or receive voice calls over LTE.
Does anyone know how to fix this? This never happened on other phones on the same network. In my specific location I get 2-3 bars of LTE and 4 bars if switched to 3G. I guess it wants to keep using the better signal.
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Click to collapse
Which rom are you on? I remember there's a specific rom that has a bad modem file. Trying updating to the latest version.

Maybe you can solve it by going to APN settings and set APN protocol -> IPv4 and APN roaming protocol -> IPv4 . That worked for me. I had the same issue.
Or try IPv4/IPv6. That's network related and maybe IPv4/IPv6 is correct for you.
I have to set it every time I flash EU or EPIC rom.
Good luck.

did you ever figure this out?
I'm having a similar problem on a Note 4 Global. Only it switches to 3G for a voice call and never switches back.

dennygreen said:
did you ever figure this out?
I'm having a similar problem on a Note 4 Global. Only it switches to 3G for a voice call and never switches back.
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Firmware update?

james1089 said:
Firmware update?
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I've updated it, and it's all the same. Once in a great while it will switch over to LTE on its own, but 99% of the time it will just sit on H+ forever even though I know the LTE is fine wherever I go.
I guess this is just how it's going to be.

I finally fixed this by wiping everything in twrp and flashing a newer version of the global stable rom. LTE works fine now, and it doesn't stick on H+ when I make a call anymore.

dennygreen said:
I finally fixed this by wiping everything in twrp and flashing a newer version of the global stable rom. LTE works fine now, and it doesn't stick on H+ when I make a call anymore.
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That's interesting. I guess Xiaomi fixed the bug in one of the releases. I wonder why you had to wipe everything though. What if we try to flash the latest modem. Is there a link to that? Would that work?

Would modem be the same as firmware? There's a thread on here that has those. None of them did anything for me.
My LTE problem is isn't fixed after all I guess. Once it loses LTE, it still never reconnects to it on its own and goes to H/H+ forever.
I guess the only thing that I've fixed is that it actually switches back to LTE after a phone call.