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Xperia Z signal drops / unable to connect to network

Last week i got my Sony Xperia Z.
After unlocking the bootloader and stuff like that I used it for a week and in this week I encountered the following problem:
Sometimes the network signal dropped to 0% and after rebooting the Xperia Z it reconnected to the network and i could use it once more.
On Wednesday the problem got worse and I needed to reboot several times a day. On Friday the Xperia Z could not connect to any network any more.
So I tried the following:
- Put my SIM card in another telephone, it worked as a charm in the other phone
- Replacing my SIM card (got a new one) worked in the backup phone but not in the Xperia Z
- Tried to manually search for network it could find the networks but when i tried to connect to it. It failed.
Now it's being shipped to Sony for Repair or Replacement.
Anybody else encountered the same problem?

Same problem here, its randomly droping the network signal, sometime comes back sometimes need to reboot the phone dont know why it happens, and i have reboot problem phone reboots it self , i wish its all software related and get fixed with software update

Me too. I'm also facing the same issue. The only way to temporary resolve is by restarting the phone. Should i sent back to Sony? or wait for an update?

im also having this problem. Are all of these phones bootloader been unlocked and/or rooted? Any stock handsets doing this? I dont know if i should try sending it back or not because its been modded.

sturtz1987 said:
im also having this problem. Are all of these phones bootloader been unlocked and/or rooted? Any stock handsets doing this? I dont know if i should try sending it back or not because its been modded.
Click to expand...
Click to collapse
My phone is not rooted its stock
---------- Post added at 10:31 AM ---------- Previous post was at 10:07 AM ----------
sturtz1987 said:
im also having this problem. Are all of these phones bootloader been unlocked and/or rooted? Any stock handsets doing this? I dont know if i should try sending it back or not because its been modded.
Click to expand...
Click to collapse
My phone is not rooted its stock

garoo10 said:
My phone is not rooted its stock
---------- Post added at 10:31 AM ---------- Previous post was at 10:07 AM ----------
My phone is not rooted its stock
Click to expand...
Click to collapse
what network is your phone on? im getting a replacement tomorrow.

got mine yesterday. everything is great except the wifi signal >"<
it is so so weak. is there any ways to make it better
same place, but ip4, ip4s and arc get better wifi signal than z

Oo, got this problem yesterday, first time in 10 days. No root, locked bootloader, everything as it should be. After I finished call, signals was lost. I had to reboot phone, to have signal again. Simcard is new, it is old as phone is. Also I don't belive it is with simcard, since I tried to search network manual, before I rebooted my phone and XZ see every possible network, just it was not able to connect to it. Reboot helped.

I am also getting this issue, my phone is stock and rooted, using Telstra in Australia.
I'll change the SIM tomorrow, but judging by everyone else, it's not the SIM. Telstra has the best coverage in Australia (by a large margin), and the Xperia Z is a "blue tick" phone, which means in network testing, it had a significantly better antenna/coverage than most other phones. So it's not the network.
It appears there's an issue with the phone, then. Hope it's software.
Do we know if it's possible Stamina Mode might be killing it? I usually find my signal gone when I wake the phone, I haven't noticed it randomly just drop out when I'm using it.

This does not seem normal, I did not have this problem yet.
I do not think it has anything to do with unlocking or rooting as:
My Xperia Z is Simlock free, bootloader unlocked, rooted and running DooMLorD his kernel.
Kind regards, Stefan.

sturtz1987 said:
what network is your phone on? im getting a replacement tomorrow.
Click to expand...
Click to collapse
Its vodafone Turkey, i dont use stamina mode, try'd sim card with another phone its workin fine, almost try everything im waiting for the update i guess its baseband related update so maybe its also fix for our issue

im wondering if it has anything to do with the screen protectors placement?
im just backing up and returning to stock rom and getting a replacement.

Hey all,
I'm having this really annoying problem as well, and it's frustrating as there seems to be no rhyme or reason to it, and the only way to solve it is a restart (although once in a while it suddenly reconnects on its own)
I'm also on stock Jellybean.

I use to have this problem as well but it is all ok now after updating to the latest firmware.

Anyone sent their phone back to Sony have any updates? I'm still experiencing this problem at least once a day and it's pretty darn annoying

If I'm not mistaken, I stopped having these drops after the .434 update.
Still have to thoroughly test it, though.

same problem with my xperia z also .i have just purchaed it and within 2 days it sarts giving network problem.tomorrow i will go to service center and will update what they says

I made repair with Sony Bridge for mac and I had no problems with signal drop last 4 days (still on .350 firmware). After I first time posted here, I had like 3 or 4 times that, but as I said after repair it is gone. Hope on some other fixes within update to 434

Im having the same problems in canada, phone was brought over from hong kong, if I dont have any APN it works fine. once I add 3G and MMS configuration it starts dropping network 5 times a minute. really frustrating, so I bought ZL, seems better in North America. Sony told me its the hardware in Z that makes in incompatible, nothing to do with software or firmware.

Yes but once I updated to .434 Rom the problem was mostly fixed

[Q] No Gsm Signal On Xperia Z

Hi guys,
I have a gsm signal problem with my my xperia z.My phone can get the gsm signal(2G/3G) very low and mostly time is says "no signal".While my Note2 shows 5 bars of signal,my xperia z can't get the signal.if i close enough to base station,it shows 1 bars,max. 2 bars.
I have tried changing sim card,changing network mode(gsm-only,wcdma only...) , try to select service provides manuelly.I have tried everything.
Please... Anyone give me feedback on this, I'm not sure it Hardware or software problem.
Thank you very much in advence.

Have you tried updating to .434? That solved all cell reception issues for me.

Yes i updated to 434,but this problem still exist.Is any one have an idea??

The phone must be faulty, return it to the store you bought it from or alternatively you can use the 2 year Sony warranty to get a new phone.
Press thanks if I have helped
Sent from my C6603 using xda app-developers app

Hi, pls did u eventually find a solution to your problem of no signal, cos I'm facing same issue now. Will appreciate if you let me know. Thanks

[Q] Xperia Z won't answer calls

Hi! I'm new to this forum.
I'm working as an IT manager, and have a user who has a Xperia Z. He have had problems with it since day one. The phone often does not respond when there is an incoming call, even when he uses BT handsfree and Sony SmartWatch 2.
The phone have been to service several times, replacing the screen one time, and charger port another time (the service company claimed it was broken), but I'm unsure if that means replacing the motherboard as well. We have even recplaced the sim card and tried with a twin sim card and the main card in another Z. We also tried backing up the phone and restored the settings onto another Xperia Z, and that one had no problems what so ever. We also tried backing up the other phone and restoring onto the phone with the problem, and the problem was still there.
Model number C6603
Android Version: 4.3
Baseband version: 9x15A-ACEFWMAZQ-30110082-51
Kernel version 3.4.0-g1b44cd5
Build number
10.4.B.0.569
Can anyone help?
Thanks in advance!

well it seems like the phone is indeed faulty and would need to replaced as whole... sorry for the trouble mate but you have tried everything at hand...

I was afraid of that... But thanks alot for the answer! Now I just hope that the service company agrees with us

Xperia Z Network Problem

Hi,
I'm using Xperia Z c6603. I face a different type of problem. My phone shows all the signal bars yet I'm not able to recieve any phone calls or dial them. I replaced my sim card, yet tit didnt help. Can you guys help me out. I have also flashed my phone.

CyrilThomas92 said:
Hi,
I'm using Xperia Z c6603. I face a different type of problem. My phone shows all the signal bars yet I'm not able to recieve any phone calls or dial them. I replaced my sim card, yet tit didnt help. Can you guys help me out. I have also flashed my phone.
Click to expand...
Click to collapse
Flash full stock ftf and try again

I tried but it didn't help. Any other suggestions

guys please help me out with this, it is very irritating

Try to keep your phone in 2g only mode. When i keep 3g only only mode i sometimes can't receive call from other party. But 2g only mode solved my problem....
Sent from my C6602 using xda app-developers app

How do I shift it to 2g mode?

menu->settings->more..->cellular network->network mode-> Only GSM
PS. type: *#*#4636#*#* and check in "phone info"
signal strength
GSM service(if enabled)
In old galaxy spica I had similar problem and I had disabled GSM(dunno why) and after second full flash of fresh stock ROM It was working again.

its not helping
I tried everything possible.

So maybe we start from beginning...
Few quick question before we can help you:
1. When those problem started?
2. After what? did you flash custom rom or Kernel ?
3. You had any app/script that could modify your phone?
4. You had ANY hardware problem before?
5. Your phone fall to the ground?
6. Did it have any contact with water?
7. What system do you have now.
8. did you check sim slot?
9. do you have signal strength in this menu that i post earlier?

1. This problem started a month back
2. It all started suddenly, I am on the stock rom without root
3. No I dont have any app that can modify my phone
4. Yes I had a faulty battery problem which was fixed
5. NYes once it had but it was a long time back before the problem started.
6. No it did not have contact with water
7 I use the stock android 4.4.4 kitkat
8 Yes I have checked my sim card slot, I have also replaced my sim a couple of times
9. Yes I have signal strength -79dbm and 25 asu
My sim works well with my other phones. Is it a hardware issue?

I think Im getting a clear view of the problem, my phone isnt able to shift from 3g to 2g I guess. I came to this place where only 2g works, I had my network mode setting as Wcdma(preffered)/gsm, its reluctant to shift. Is it a hardware problem?

Hmm.... If you have signal and phone see network its not hardware problem. To be honest its more like system or more specific kernel problem in 4.4.4 I say this because you ares sixth person who i know that have network problem in 4.4.4
For examle after flashing kk on my phone i have looooooots of reboots if i have 3g network on, and my phone swith to 2g if its in sleep mode.
My friend also have problem similar to yours but it cant use phone function if its have LTE enabled.
Best part is that when he flashed 4.3 problem is still there, but he didnt had it before when he had 4.3
I cant flash any other system now(i use phone too often )so i dont know if i also would had this problem...
So if you can, you could flash even 4.2/4.3 full clean rom and check, just to be sure. Its a bit "extream" downgrade but flashing it and checking its max 1h...
Probably like always its small weird bug or specific system setting problem, maybe different region rom...
So for now you could check other rom, even branded and downgrade to your old 4.3 to see if you still have such problem.

Seriously its a relif that its not a hardware problem yet.
I also flashed the lower version of the kernel. I am facing the same problem . I use the local region ROM only,
I think Im gonna give up on sony now

Hi there
You are not alone, I am also facing this issue and do not know how to resolve it too.
Sometimes when I try to call (full bars on) it makes a bipbip then Call not possible...
Same issue while switching from GSM to H... Most of the time I have to reboot and let it settle for a while.
I am suspecting my network provider
Sent from my C6603 using XDA Free mobile app

I called up the service provider, it seem to get fixed for a day but again the same problem continues
I'm tired of this, the phone guys can't do anything and neither can the service providers
Such an irritating bug by sony

Did anyone get a solution to this problem?
This is very annoying

Same problem,posible solution temporary.
I'm in spain,having a virtual operator sim called ono,is using vodafone infrastructure.Is needed to have roamin allways activated for data and call to work properly.When stucks to connect,i put in flight mode 1min.With orange sim no problems.With ono sim in a windows phone i had no problem.Now i demanded a sim 4g,will see if are changes.

Woahh happend to me as well , but it happend after turning on mobile data in 15 minutes my network stopped .

silviuilie said:
I'm in spain,having a virtual operator sim called ono,is using vodafone infrastructure.Is needed to have roamin allways activated for data and call to work properly.When stucks to connect,i put in flight mode 1min.With orange sim no problems.With ono sim in a windows phone i had no problem.Now i demanded a sim 4g,will see if are changes.
Click to expand...
Click to collapse
Did it help you??

Call dropping after 58.1.A.5.159 update

Hi folks,
after the last update I have a big problem: when I start a call suddently the signal goes 0 (on both SIMs) and I receive a "no network" error. After a few seconds the signals go back but sometimes I have to wait for 15 or 20 minutes to call otherwise the call drops again.
It happens even when receiving calls.
I have this problem at around 30/40% of calls I try to make and this is very disappointing because I use the phone for work and I do many calls everyday.
A user on an Italian forum had the same problem two updates ago, he told me that he solved after a reset of the phone. I'm desperate now, tomorrow it's holiday in Switzerland so I think I will do it.
NOTE: It's strange nobody on internet is talking about this problem... It's only me?

Having the same issues with this build.
I have the HK dual sim, which I flashed the SEA firmware onto last year.
I'm having to go back to my old phone until this is resolved, I have missed several calls because of it. I tried a factory reset, which seemed to clear it up for a short while, but the problem came back.

Same problem here. After the update of
51.1.A.5.159​I cannot receive or place calls
I cannot receive or send messages
IF I am inside a building. The network goes from 2 bars to 0 when I try to call. If i go outside of the building the cellular network is stronger (full) and calls are going through. I suspect there's something wrong with the baseband maybe? Which is what I was trying to search for yesterday. Was wondering if the current baseband for Android 11 is new or maybe it is the old one from Android 10?
Regardless, I can wholeheartedly say that Android 11 has basically shattered the signal strenght on this device to the point of making it useless. Now I can use it as a multimedia device... weeeheeeee.... Buy a premium device they say, it will be worth it, they say. Never had this issue on any of my Oneplus devices. Shame on Sony!
(btw my phone has the international software, not the HK one. using it on one single sim- XQ-AT-51).

The italian user told me now he's fine, the problem didn't came back.
Tomorrow I have a Switzerland holiday, I'm going to reset the phone to try to fix the problem.
Thanks for answering my question, it seems I'm not the only one with this problem. It's a pity there's no more official Sony forum to discuss these issues.

theskig said:
The italian user told me now he's fine, the problem didn't came back.
Tomorrow I have a Switzerland holiday, I'm going to reset the phone to try to fix the problem.
Thanks for answering my question, it seems I'm not the only one with this problem. It's a pity there's no more official Sony forum to discuss these issues.
Click to expand...
Click to collapse
Please do let us know how you get going. I too wanted to perform a factory reset but I've postponed it in case I could find some answers on the internet.

1ceb0x said:
Please do let us know how you get going. I too wanted to perform a factory reset but I've postponed it in case I could find some answers on the internet.
Click to expand...
Click to collapse
The phone is now restoring the backup from Google but this evening I don't think I will make a single call.
Tomorrow at work I will stress it (usually I make 1h of calls everyday, using both SIMs), and give you the results. Cheers!

The situation is maybe worse than before.
I don't remember if is it possible to downgrade. Xperifirm? Still works with new phones?
Otherwise I have to use my old XZ Premium because I have so many issues at work.

1ceb0x said:
Same problem here. After the update of
51.1.A.5.159​I cannot receive or place calls
I cannot receive or send messages
IF I am inside a building. The network goes from 2 bars to 0 when I try to call. If i go outside of the building the cellular network is stronger (full) and calls are going through. I suspect there's something wrong with the baseband maybe? Which is what I was trying to search for yesterday. Was wondering if the current baseband for Android 11 is new or maybe it is the old one from Android 10?
Regardless, I can wholeheartedly say that Android 11 has basically shattered the signal strenght on this device to the point of making it useless. Now I can use it as a multimedia device... weeeheeeee.... Buy a premium device they say, it will be worth it, they say. Never had this issue on any of my Oneplus devices. Shame on Sony!
(btw my phone has the international software, not the HK one. using it on one single sim- XQ-AT-51).
Click to expand...
Click to collapse
The thing I noticed is that the call drops when switching network from 4G to 2G. Expecially on my Italian SIM, i have a weak 4G signal in my office (1-0 bars) but I have a full 4 bars 2G signal. Before this update when I start a call you can clearly see the signal bar going from 0-1 to full 4 meaning the phone switched to 2G. After this update it was impossible to place a call from my office on my italian SIM because it fails in that 4G/2G switch.
I put that SIM in "GSM only" and I had no issues in managing calls. It's unpractical but works.
The problem is worse on my Swiss SIM (the one I use for work) that has no 2G coverage, so I leave it in 5G/LTE/WCDMA/ecc ecc and hope the best. But I see some switch happens even there ranging from 0-1 to 3 bars (I think is 4G/3G switch. I don't have 5G or 2G coverage in my office). So I can't do anything to avoid the issue, that happens randomly but it's quite frustrating

(...)Same problem on HK. Does anyone think that the problem will be solved with an update? Sony flagship haha. The gsm signal was much weaker than the former P20pro before .... 178. Now ..... disaster. I think the only asset Remaining that you can read "network unavailable" on a 4K screen

So far mine seems much better after the latest update 58.1.A.5.222.
Here's hoping it was a temporary glitch.

Please try to use only one SIM until new updates.
I have the same issues but with only one it works fine.
Do we have any news about a new update so far ?
Have a good day!

Today the 58.1.A.5.222A update arrived, I tested the phone and seems to be OK, tomorrow I will test it harder during the workday.
PS: since two weeks I was using my old XZ Premium and the 1 II was resting in the drawer. So sad. I tried to flash another firmware but I had errors on Flashtool and newflasher. Nothing worked wtf.

After a working day in my office with many calls on both SIMs (a place where the problem was at its best as wrote before) I can confirm you the update completely solved the problem.
So thanks to everybody for the support, I hope you'll also be able to fix it with this update.
beachbloke said:
So far mine seems much better after the latest update 58.1.A.5.222.
Here's hoping it was a temporary glitch.
Click to expand...
Click to collapse
"Temporary glitch" un par di balle*: 3 weeks with my old XZ Premium, and the actual flagship "Xperia 1 II" in the drawer! And resets, backups, restores, tests, copying gigabytes of data from and to the phone, hours of trying to flash other firmwares and receiving only errors...
* https://forum.wordreference.com/threads/par-di-balle.1875980/

theskig said:
Today the 58.1.A.5.222A update arrived, I tested the phone and seems to be OK, tomorrow I will test it harder during the workday.
PS: since two weeks I was using my old XZ Premium and the 1 II was resting in the drawer. So sad. I tried to flash another firmware but I had errors on Flashtool and newflasher. Nothing worked wtf.
Click to expand...
Click to collapse
I got the same software number and my problem still persists. Thank you for updating the thread with your findings. Glad to hear yours is working now.

Hello everyone, I faced the same issue on my device after updating to the software version mentioned by author, I've fixed the issue by flashing .280 software for SEA customisation. Original one was HK. So, now I'm able to use my phone as usual. Hope this tip will help somewho. Good luck with your devices.