[Q] S4 keeps losing signal on 4.3 - Galaxy S 4 Q&A, Help & Troubleshooting

Hello!
So my S4 i9505 always loses the signal when the lock screen is on, then I have to restart the phone/turn on and off airplane mode to get it back, but as soon as the lock screen is activated it loses the signal again. This only happens after the stock 4.3 update, I've also tried flashing to foxhound 4.3 but the same thing happens there, but when I flash back to 4.2.2 I don't lose the signal at all! does anyone know how to fix this?

I've got the same problem here. Using the Angels & Demons V16 (Android 4.3)

zaney112 said:
Hello!
So my S4 i9505 always loses the signal when the lock screen is on, then I have to restart the phone/turn on and off airplane mode to get it back, but as soon as the lock screen is activated it loses the signal again. This only happens after the stock 4.3 update, I've also tried flashing to foxhound 4.3 but the same thing happens there, but when I flash back to 4.2.2 I don't lose the signal at all! does anyone know how to fix this?
Click to expand...
Click to collapse
You need to update your modem to 4.3 to fix ur dropping issue. And please this has been answered so many times. Atleast use the search button. Thank u
Sent from my ohone.

Update the modem will fix this for you..

Related

[Q] Network Signal Loss when screen timout / awake occurs.

I Recently updated my rom to Android 4.3 see attached for current information.
Before I installed I did a full wipe via clockwork mod, I have also flashed other Roms prior to the one shown and still suffered the same problem.
I currently reside in the UK and to my knowledge my S4 is unbranded however it currently uses a contract sim from the UK network carrier Three.
On a previous build of Android I was using the rooted stock rom and never suffered any issue.
My Problem:
When my screen times out and is once again awaken via the power button, I loose my network reception. To get the reception back I have to put my phone in flight mode and the turn it off again. The network signal stays until my screen times out again.
I have spent most part of the day looking for a solution including flashing various modems, to no avail. So I have finally admitted defeat and hope that someone here could be kind enough to point me in the correct direction.
Problem fixed thanks to hawkerpaul who posted here:
Installed I9505XXUEMK8-PRE-ROOTED-Odex-KNOXFree-CWM.zip quoted here:
Then installed the MK8 modem via Odin 3.04 :good:

[Q] Android 4.3 + Radio bug!

Hi, I upgraded my phone to 4.3, and ended up with a buggy phone. Firstly i wasnt allowed to turn on wifi, or update my phone.. or install KNOX. Also, my radio kept rebooting, especially after i've turned the screen back on, after having it off..
Soo, i rooted, flashed Echoerom and the wifi-problem dissapeared, but the radio problem is still there.
I heard Nexus people had luck on flashing 4.2.2 radio on their device, but i dont know if it will work with mine?
I9505, Nordic edition. I9505XXUEMJ7_I9505OXXEMJ8_NEE is in the bottom on my phone.
Not sure what kind of Radio I should flash, or where I can find it
Anyone?
Okay, i found out: I had to change my preferred dataconnection away from LTE/HDSPA etc and just force GSM.
Settings->Connections->More networks->Mobile networks->Network mode-> GSM ONLY
Hope this helps anyone else =)

No sound on phone anymore - Solved

so I spent yesterday trying to get my bell Galaxy s4 unlocked so I can use it on rogers
when I got the phone I updated to 4.3 right away not knowing the issues it would give me
after trying long and various roms I decided to flash stock 4.2.2 thru odin
my phone went from 4.3 on i337vlluemk6 baseband to 4.2.2 on i337mvluamdj baseband
I was then left with a new issue....... I now couldn't enable wifi
so I flashed another rom and wifi was able to be enabled no problem(did not change baseband)
to my surprise I was able to unlock the phone successfully now using region lock away.
"VICTORY IS MINE!" I proclaimed
until I noticed something................I now have no sound coming out of my phone. I tried another rom and still no sound.....so I flashed stock thru odin once again. Again the wifi doesn't work and there's still no sound
anyone know what might cause this or how I can fix it? Phone isn't of much use to me if I can't hear it lo
Edit: thru scouring google I was finally able to find a solution on here. Apparently I just had to reflash stock 4.3 and it now works
another thing
even though the phone is unlocked I 'm not able to dial out on it
doing so caused the phone to lock up
this happens in stock as well as 2 roms I tried
the data connection works just fine and I'm able to browse the web with my LTE
I dunno if this helps anyone but if I go in to service mode I can't even select audio as an option.
It's there (number 5) but if I choose it it does nothing
Same issue
I have the exact same issue. I was trying to get to Google Play Edition which I have done many time before, but this time the baseband version changed. Now I also have no sound, so wifi and my phone is locking up when I make or receive calls. HEEELLLPPP!!!!

[Q] Phone keeps droping signal - can't make calls - have to reboot to get signal

New problem here - this has been happening for about 3 weeks now.
I have i337 on AT&T rooted running NB1 Baseband and Danvdh's GPE rom
For the last 3 weeks my phone reception has been dropping out completely and I have to reboot the get signal. I can not make or receive calls and switching to Airplane mode and back does not help... I have to reboot to be able to make phone calls again.
I have tried all the new 4.3 and 4.4 modems and have switched back and forth between Danvdh and iB4StiD's GPE - I was running iB4STiD's rom for the last 6 months with zero problems...
I have checked my APN and all the information is correct when I am connected to a network .
Any help would be greatly appreciated
I switched to a touchwiz ROM and noticed that the phone says Sim can not be detected and requires a reboot to re recognize Sim card... I have replaced the Sim card today and same issue persists... Any help?
Sent from my GT-I9505G using Tapatalk

wifi not working

just changed my modem from MDC to NAE via Odin and encountered a lot of issues when on NAE modem WiFi wouldn't switch on the phone took ages to boot up could not dial any numbers or make calls kept coming up with unexepected errors and force closing, So then i went back to MDC modem and still no wifi tap the on button it wont come on the phone is 4.2.2 rooted MF9 and MDC any ideas to get this sorted . or advice on a diffrent modem or a update
j4gz said:
just changed my modem from MDC to NAE via Odin and encountered a lot of issues when on NAE modem WiFi wouldn't switch on the phone took ages to boot up could not dial any numbers or make calls kept coming up with unexepected errors and force closing, So then i went back to MDC modem and still no wifi tap the on button it wont come on the phone is 4.2.2 rooted MF9 and MDC any ideas to get this sorted . or advice on a diffrent modem or a update
Click to expand...
Click to collapse
Along with this, what rom are you currently running and what recovery?
its totally stock and i do not have a recovery as far as im aware
j4gz said:
its totally stock and i do not have a recovery as far as im aware
Click to expand...
Click to collapse
I did a little reading and it appears you have had this problem for some time, end of April at least. You need to be able to determine if you have root. You are not sure what your recovery is...it also appears your phone may be international that you have been trying to unlock sim on. Not sure if I will be able to help until some of these questions can be answered.
Hi yes the phone is rooted and also is international unlocked it is a sprint l720 that I have the wifi was working before but not to its full potential it's signal was very weak and kept dropping out, since I upgraded the modem to the NAE modem the wifi will not switch on at all despite pressing the button for it . So I then reverted back to the previous modem which it was before which was the MDC and still face the same issue.
Have you done a basic battery pull? Had the same problem and that worked surprisingly. Left it out around thirty seconds.
Yep tried that still no joy wont let me switch wifi on
This is my phone info if that helps
Sent from my SPH-L720 using xda app-developers app
Have not heard a response yet so I take it that my phone is a no go and will be able to get the wifi sorted . How much can 8 expect to sell the phone for I have really had enough with the sprint variation
Sent from my SPH-L720 using xda app-developers app
This might help.
j4gz said:
just changed my modem from MDC to NAE via Odin and encountered a lot of issues when on NAE modem WiFi wouldn't switch on the phone took ages to boot up could not dial any numbers or make calls kept coming up with unexepected errors and force closing, So then i went back to MDC modem and still no wifi tap the on button it wont come on the phone is 4.2.2 rooted MF9 and MDC any ideas to get this sorted . or advice on a diffrent modem or a update
Click to expand...
Click to collapse
My girlfriend had this problem on her unrooted s4. Wifi would not turn on , nor scan, or do anything. She was freaking out. All I did was take out the battery, sim car, and press the power button a few times. Left it that way for about 10 seconds. Put battery , sim , back in and restarted. Worked fine.
---------- Post added at 02:03 AM ---------- Previous post was at 01:31 AM ----------
j4gz said:
Have not heard a response yet so I take it that my phone is a no go and will be able to get the wifi sorted . How much can 8 expect to sell the phone for I have really had enough with the sprint variation
Sent from my SPH-L720 using xda app-developers app
Click to expand...
Click to collapse
Remove the sim card as well as the battery. Press the power button a few times with battery and sim out. Put back together.
Flash the complete mf9 rom.
hi thanks for the advice i managed to get the mf9 firmware by odin on the phone and the WiFi started working again, im still facing the same problem of a weak signal unless im in the same room as the wireless router when it is at full strength tried resetting the router changing the parameters and still no joy , if any body has any other solutions pls share .
What router do you have? Did you factory reset your phone after flashing mf9?
I have a dlink dir 615 router which I updated to the latest firmware and also reset which didn't help and I never done a full factory reset as the phone rebooted itself after flashing the mf9 firmware on to it
Bump
Anybody help me out here ? What do I try to get this issue resolved ?
Still no replies that is fantastic !!!
Overwhelmed with so much support from this forum
Is your router dying? Do you have any other devices that connect to it?
Does your phone's WiFi work on any other WiFi network?
The router connects fine and strong signal to all my other wireless gadgets like ps3 ipad smart tv . I have these issues with nearly every wifi connection made regardless with my s4 the signal is very weak or nothing at all .

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