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[Q] Xperia V reboot issue with LTE network

I noticed that the phone randomly rebooted from it's idle screen. Then, after checking it out with my friends' phones, I found out that they also have the issue. Then I found out this only happened when it was in the LTE coverage.
So after some traces in the mobile switch with the help of a collegue, I was able to pinpoint the issue towards the LTE's CS fallback method.
(CS fallback is what happens when your network does not support voice over LTE, thus, the phone automatically falls back to the 3G network.)
It happens when I make a call or receive a call. When the switch pages the phone, it sometimes cannot fallback to the HSPA or 3G network. It makes the phone get stuck in some way, I think some watchdog in the chipset reboots it.
Have any of you experienced it? Do any experienced developers here know of a workaround? if you want logcat or any other traces, I can provide them.

Sony Xperia V reboot when LTE network
tharaka said:
I noticed that the phone randomly rebooted from it's idle screen. Then, after checking it out with my friends' phones, I found out that they also have the issue. Then I found out this only happened when it was in the LTE coverage.
So after some traces in the mobile switch with the help of a collegue, I was able to pinpoint the issue towards the LTE's CS fallback method.
(CS fallback is what happens when your network does not support voice over LTE, thus, the phone automatically falls back to the 3G network.)
It happens when I make a call or receive a call. When the switch pages the phone, it sometimes cannot fallback to the HSPA or 3G network. It makes the phone get stuck in some way, I think some watchdog in the chipset reboots it.
Have any of you experienced it? Do any experienced developers here know of a workaround? if you want logcat or any other traces, I can provide them.
Click to expand...
Click to collapse
Hi Tharaka,
Im exerience this behaviour since september of this year, in Spain with my carrier Yoigo, i have solved partially changing it to use only WCDMA/GPRS. I have this phone since May of this year, first in Japan where it worked very well, and then i move to Spain in June, during June - Sept the phone worked very well, then it began to reboot very often.
Hope they solve this soon...

josealb85 said:
Hi Tharaka,
Im exerience this behaviour since september of this year, in Spain with my carrier Yoigo, i have solved partially changing it to use only WCDMA/GPRS. I have this phone since May of this year, first in Japan where it worked very well, and then i move to Spain in June, during June - Sept the phone worked very well, then it began to reboot very often.
Hope they solve this soon...
Click to expand...
Click to collapse
Hi
I've got the same problem with my xperia v since monday in france (free mobile).
No problem when i set WCDMA instead of LTE.

We were able to fix this from the carrier side in Sri Lanka. It should be done from the carrier. If I remember correctly, this was done using allowing something like data handoff. If anyone is interested in whats needed in the carrier side, ping this thread.

tharaka said:
We were able to fix this from the carrier side in Sri Lanka. It should be done from the carrier. If I remember correctly, this was done using allowing something like data handoff. If anyone is interested in whats needed in the carrier side, ping this thread.
Click to expand...
Click to collapse
what was the issue? I have similar problem with Xperia M Dual , but with 3G connection. Edge is working fine, but with 3G the Phone keeps restarting. My Provider 3 / Drei austria / Hutchinsons Austria. With other providers there is no issue.

bump
any updates?

23.4.A.0.546 - Z3C 5.1.1 4G - Signal Problem

Hi Everyone,
Anyone having same problem w/ signal if its set to 4G/3G/GSM,? I never had issue with previous firmware but issue just started w/ 5.1.1, I tried downgrading and it works, and upgrade back to 5.1.1 and experiencing same issue, if i'll select "GSM only" I have high signal.
Any solution for this or changing baseband?
Thank you.

Shizuwi said:
Hi Everyone,
Anyone having same problem w/ signal if its set to 4G/3G/GSM,? I never had issue with previous firmware but issue just started w/ 5.1.1, I tried downgrading and it works, and upgrade back to 5.1.1 and experiencing same issue, if i'll select "GSM only" I have high signal.
Any solution for this or changing baseband?
Thank you.
Click to expand...
Click to collapse
I experienced the same problem on .546, here in Dallas AT&T has a strong LTE signal but my z3 only showed one bar consistently throughout the day. I found no way to remedy this other than downgrade back to 5.0.2.

Sony xperia z3c mobile data problem
Hi,
sorry for my bad english. After the latest aktualization 23.4.A.0.546 (Android 5.1.1) I have a problem with interrupted mobile data connection (3G, 2G), permanently connect, disconnect. 4G holds on (done up), but very bad signal, rather none. Device is factory reseted after the actualization, sim card is OK, operator (T-mobile CZ) doesn’t see any problem with configuration. Before the actualization no problem. Question posted on official technical support Sony a week without response. In my opinion - bugged actualization. Anyone any idea?
Sony xperia Z3 compact
T-mobile Czech republic operator

Issues
The 4g is really weak but I'm also having trouble with phone calls. The caller cannot always hear me. I have to switch back and forth between speaker and handset. As a result callers hang up on me but also because the signal is weak my calls drop. Another issue I have is when I logonto WiFi all running apps fail to operate data specific features. For example if I long g into WiFi my whatsapp will stop sending and receiving messages and if I go back up cellular those messages will sometimes leave the queue but generally I have to restart my phone.
Body lock feature on smart lock does not work, first day out out caused me a huge problem with a girl I was seeing. I should add that these issues are also being experience by my friend, we both have the z3c USA version.

yeah I am having issues as well where it drops out and gets weak. I have another 4g phone on the same network and that isnt having the issues.
edit: using 23.4.A.0.546 - Unbranded - BALTIC (1288-5413) on a UK z3c

I have no problems with signal strength. In the place of my tests I have always 100% coverage.
But I have observed very slow change 3g / 2g to lte (preferred) / 3g / 2g. The delay was 2 to 3 minutes to switch from 3G to LTE. I have done many many tests.
Maybe finally I managed to solve: I have opened mobile mode info with * # * # 4636 # * # * and I changed mode LTE / WCDMA. Now the connection to LTE is faster, 15 to 20 seconds.
Maybe you can try the mobile mode info.
I continue to report more tests.
I using NCB 1288-5411 23.4.A.0.546_R14C (Nordic Combined) customized Slim Wajk . In Spain.

Lte only
That works for me but now I cannot make calls because voice is handled in the 3g network. Ideas?
---------- Post added at 12:57 PM ---------- Previous post was at 12:50 PM ----------
Lte/GSM(auto prl) works for me and resolves the data issues

I switched to the UK o2 version (my carrier) and things seem to be back to normal and I now have the NFC icon in the notifcation panel, something absent on the version I had installed before.
very odd. but I like the o2 version as it allows me to chose just 4g/3g/2g etc for when I am in areas of bad signal, not something the other versions give you as much control over.

Blah
Still the same issues. Hopefully Sony can patch this.

Azazelix said:
Hi,
sorry for my bad english. After the latest aktualization 23.4.A.0.546 (Android 5.1.1) I have a problem with interrupted mobile data connection (3G, 2G), permanently connect, disconnect. 4G holds on (done up), but very bad signal, rather none. Device is factory reseted after the actualization, sim card is OK, operator (T-mobile CZ) doesn’t see any problem with configuration. Before the actualization no problem. Question posted on official technical support Sony a week without response. In my opinion - bugged actualization. Anyone any idea?
Sony xperia Z3 compact
T-mobile Czech republic operator
Click to expand...
Click to collapse
Hi Azazelix,
I'm also in TMCZ network and I used to have data connection problems (losing data connection when travelling) with others than T-Mobile CZ branded fw.
Since I'm on branded TMCZ LP fw, all problems are gone.
I'm guessing it might have something to do with radio version -> now I have 8974-AAAAANAZQ-00063-42 and no problems.
As far as I know TMCZ branded 5.1 is not released yet! -> thus my suggestion for going back to latest TMCZ branded fw and hold on until TMCZ branded 5.1
is gonna get released.
Good luck to you!

The Sony support forums suggested that you changed your app settings. In your app settings where it says ipv6, change it to ipv4. This seems to have worked for me however I'm still having issues with people hearing me when I use speaker phone.

No news? Im brazillian. The same problem with 5.1.1
Unique solution is back to 5.0.2?

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.
Click to expand...
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.
Click to expand...
Click to collapse
Firmware update?

james1089 said:
Firmware update?
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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.

S10 4G bug?

has anyone noticed that the 4G on the S10 is quite buggy?
the speeds are extremely unstable, and sometimes completely unusable. (not a problem with the carrier, tried it on another phone and it's fine)
What I've noticed is that if it ever goes into medium power saving, 4G will stop working completely, it'll still show 4G, and i can still make calls, but no internet connection, even after exiting power saving mode. The only fix is I'd have to restart the phone for 4G to work again.
anyone have the same problem/ knows a fix?
I've read that I should do a factory reset, but I really want to avoid that, setting up the phone is time consuming.
Side note: battery life is not as good as expected, but that seems to be an issue for all exynos, not just me.

Same Problem here i unlock phone 4G shows but it tanke some time if i can use the Internet
Speed is Very slow and unstable

I am having connectivity problems as well. Keeps loosing the connection. I have to turn on airplane mode then turn it off all the time.

I don't have any problems with network connectivity, so far. In the link my result a moment ago: https://www.speedtest.net/my-result/a/4796337263
Hope you get some sensible connectivity soon. Cheers!

Same issue here! It was fine since I first received the device, but yesterday, I manually changed the network toggle to get better indoor signal. However, even after setting the toggle back to the original setting the LTE and data service kept dropping out. I tried manually toggling, switching network bands, etc... but nothing worked. It just keeps dropping data service.
I just hard reset the phone moments ago, and will update accordingly!

Update - Even after a network reset and hard reset it still dropped to Edge data a few times. However, after the last hour or so, it has locked back on to LTE+ and is holding strong. Seriously hope this is a software bug and not a bum radio chipset or antenna.
a99tandem said:
Same issue here! It was fine since I first received the device, but yesterday, I manually changed the network toggle to get better indoor signal. However, even after setting the toggle back to the original setting the LTE and data service kept dropping out. I tried manually toggling, switching network bands, etc... but nothing worked. It just keeps dropping data service.
I just hard reset the phone moments ago, and will update accordingly!
Click to expand...
Click to collapse

I'm on tmobile and my data is horrible in certain and what's weird I have all bars.
Sent from my SM-G965U using Tapatalk

not sure if i should say that its good to know I didn't get a dud.
but man, samsung needs to get their sh*t together, this is not acceptable for a flagship phone.
looks like i'll have to do a factory reset soon.

I'm on tmo as well. I have a feeling it's just jacked up radio software. I did some more tweaking and went into band settings *#BAND# on the dialer and disabled all the LTE bands that aren't used by TMO and that seems to have helped as well. It think this issue is congruent to the known issue with Sprint devices trying to connect to incorrect bands. I haven't used it out and about yet, but it definitely helped my phone stay latched on to LTE from my home. Additionally, when it does drop to HSPA, it doesn't get stuck like it used to.
I recommend tweaking the band setting before doing a hard reset.

Update - still doesn't fix the problem. Pains me to say it, but I'm afraid I have a hardware issue. I'm going to try a sim card swap as a last ditch effort, but will also seek an exchange as well just to get ahead of the problem.

a99tandem said:
I'm on tmo as well. I have a feeling it's just jacked up radio software. I did some more tweaking and went into band settings *#BAND# on the dialer and disabled all the LTE bands that aren't used by TMO and that seems to have helped as well. .
Click to expand...
Click to collapse
This shortcut only works on Snapdragon version, do you have Snapdragon with 4G issue?

This code only runs on the Qualcomm chipset version. Oddly enough, my friend with the Exynos version has no problems, even though he's missing a couple of TMO bands for the US.

Yeah I have Exynos S10+ as well and it runs fine on T-mobile USA

a99tandem said:
This code only runs on the Qualcomm chipset version. Oddly enough, my friend with the Exynos version has no problems, even though he's missing a couple of TMO bands for the US.
Click to expand...
Click to collapse
This code is not working on SM-G9730 Qualcomm Hong Kong version. Any ideas?

Same problem here. I got the snapdragon US unlocked variant using here in Spain and compared with my old Google pixel, they do not have the same speed LTE connectivity even using the same SIM card. I tried to force using the 20 BAND (800 MHz) but I dont really know how. My galaxy s10 plus is using the BAND 3 so it does not let it picking the fastest possible band in my city. Any ideas? I also did think galaxy s10 plus US variant did not have 20 LTE band, but I checked it and realize it even does. One more question, what is the difference between 4G and LTE? Here in Spain all devices are running 4G, not seen any device running LTE, but my new samsung does. How can I switch it to 4g or LTE+? Thank you everyone boys.

just wondering if anyone has gotten the ASCA/ASC8 update and can report whether this problem is solved wit firmware update?

Bands matter depending on where you are. Depending on your area, only specific bands will be used. However, some bands used, while not faulty, are easily interfered for some reason with cases or other obstructions like your hand. Most likely, Samsung is planning to give a large update considering signal direction. I would probably not factory reset if you have a lot of data, and the problem would probably come back.

I ended up having to send my device in to Samsung for analysis and repair. I'll keep everyone updated.

after ASC8 update, i think the problem has been solved, havent noticed any problems so far

Question Big issue, No Data during a call.

So One thing I discovered on this new phone of mine is that although working perfectly there is a major flaw in the way Internet data works during a phone call.
Any time you make a call, the phone downgrades the active signal from 5G/4G to H or E ( GSM).
Which in turns cuts off the data.
If I force 5G or 4G, then the phone call cannot be made. It just disconnects.
I have tried all settings, Volte enable/disable with no joy.
Some have said it's a carrier limitation, but it's not, cause in my iPhone, the very same simcard works just fine and the Internet is usable during a call.
Also tried with dual Simcard setup. As in the settings, the phone allows to use one simcard for data and one for call. Still not working.
Can someone please tell me if there is a solution please, or can you try your phone while on the call to see if Internet works as this feature is detrimental to me keeping the phone. If this doesn't work I will be selling the phone and getting a realme replacement.. Xiaomis sometimes suck with their non existent support.
Thanks

Evo400 said:
So One thing I discovered on this new phone of mine is that although working perfectly there is a major flaw in the way Internet data works during a phone call.
Any time you make a call, the phone downgrades the active signal from 5G/4G to H or E ( GSM).
Which in turns cuts off the data.
If I force 5G or 4G, then the phone call cannot be made. It just disconnects.
I have tried all settings, Volte enable/disable with no joy.
Some have said it's a carrier limitation, but it's not, cause in my iPhone, the very same simcard works just fine and the Internet is usable during a call.
Also tried with dual Simcard setup. As in the settings, the phone allows to use one simcard for data and one for call. Still not working.
Can someone please tell me if there is a solution please, or can you try your phone while on the call to see if Internet works as this feature is detrimental to me keeping the phone. If this doesn't work I will be selling the phone and getting a realme replacement.. Xiaomis sometimes suck with their non existent support.
Thanks
Click to expand...
Click to collapse
This comes from the operator who has not yet communicated with Xiaomi.
Same case with 2 operators on the same phone.
What version of rom?

NOSS8 said:
This comes from the operator who has not yet communicated with Xiaomi.
Same case with 2 operators on the same phone.
What version of rom?
Click to expand...
Click to collapse
Global ROM 13.0.4
I can't see an operator fault if they have Volte services enabled and this simcard works flawlessly on other android systems.
As a matter of fact, any SimCard i have tried, so far 3 providers and the phone does the same thing. As soonest the call is made it downgrades the signal to H while full 5G or 4G is available??

Evo400 said:
Global ROM 13.0.4
I can't see an operator fault if they have Volte services enabled and this simcard works flawlessly on other android systems.
As a matter of fact, any SimCard i have tried, so far 3 providers and the phone does the same thing. As soonest the call is made it downgrades the signal to H while full 5G or 4G is available??
Click to expand...
Click to collapse
the operator must provide the necessary information for each brand and phone to activate Volte and Wowifi.
On my 11t pro everything works with SFR and nothing with FREE because Free has not yet transmitted the information necessary to activate the services.

So went to see the operator. They sell Xiaomi phones. 3 network ( Three EU)
The phones in the stores are working just fine, no issues at all. And my phone simply just isnt.I have tried every possible setting and still not working.
See the screenshot below. As I'm typing this I'm on a super fast full signal 5G connection. As soon as I make a phone call, the phone will downgrade to E or H+ which is horrible. This network signal switching is also laggy, and If 2g signal is poor I cannot even make a call.

Evo400 said:
So went to see the operator. They sell Xiaomi phones. 3 network ( Three EU)
The phones in the stores are working just fine, no issues at all. And my phone simply just isnt.I have tried every possible setting and still not working.
See the screenshot below. As I'm typing this I'm on a super fast full signal 5G connection. As soon as I make a phone call, the phone will downgrade to E or H+ which is horrible. This network signal switching is also laggy, and If 2g signal is poor I cannot even make a call.
Click to expand...
Click to collapse
Does the "Use VoLTE" switch appear in the SIM card settings?
If not you can try the Dialer Code *#*#869434#*#*. That only will make this switch appear, but sometimes this is enough. It should also show the little VoLTE-Badge next to the signal strength (see screenshot).

Deleted

I just had another look and on your 1st post it says the SIM is named "3 IRL", as far as I know Three Ireland does not offer VoLTE at all.
So it will always drop to 3G/H+ or 2G/E ... on every phone.

mici01 said:
I just had another look and on your 1st post it says the SIM is named "3 IRL", as far as I know Three Ireland does not offer VoLTE at all.
So it will always drop to 3G/H+ or 2G/E ... on every phone.
Click to expand...
Click to collapse
5G connection should support this naturally. If I put this simcard Into an iPhone or Galaxy the 5G connection stays on regardless.
Anyway even with Vodafone this doesn't work,so I'm thinking it either a phone limitation or a phone is fooked

Evo400 said:
5G connection should support this naturally. If I put this simcard Into an iPhone or Galaxy the 5G connection stays on regardless.
Anyway even with Vodafone this doesn't work,so I'm thinking it either a phone limitation or a phone is fooked
Click to expand...
Click to collapse
No, for VoNR your phone still needs the same configs as with VoLTE. Though only a few operators support VoNR as of now.