Develop Bugs

No signal

I have no signal on my galaxy nexus. It just started doing this today, haven't had a problem for 3 months or so. It just started today, and once in a while there is a little R above where the signal bars would normally be. How do you fix this?

The R is for roaming and just go to settings then mobile settings then click on system select and click on home only and also click on network mode and just click on CDMA/EdVo auto and that should help it to not roam and stay on sprints signal hope that helps ..let me know if u need any other help and also make sure u updated to latest PRL

Dude mine just started doing this yesterday look at top right of screen shot no signal !!
Sent from my Galaxy Nexus using xda app-developers app

Mine did the same thing too -- lost signal - Google GSM play store phone that was less than two weeks old.
After few reboots trying to diagnose the issue, the IMEI changed to UNKNOWN in the "about phone" -> status
/factory was intact and undamaged - a backup of /factory - showed that none of the files had changed. The radio appears to have failed..
Called Sammy and got replacement cross-shipped - and sent the broken one back..

Got a new Sim card works fine
Sent from my Galaxy Nexus using xda app-developers app

Mines done this several times and it always took about two reboots to get a signal again. It said I needed to insert a valid sim card...
Sent from my Galaxy Nexus using xda app-developers app

Even without a a sim I used to get bars and "Emergency calls only" - After it flacked out, I would no longer get any bars.. when I tried to search for networks it would error out immediately. I tried three different sims, none of them were recognized..

Once in a while, my phone will loose data connection. The 'data icon' in the status bar, turn from blue to grey and the only way to get data working again, is to reboot the phone.

Had it happen a couple times now. Airplane mode toggle on/off works to fix it.

Mine losses connection when I leave a WiFi network. Also here and there it looses signal so bad I have to go into airplane mode and back to land mode.
Sent from my Galaxy Nexus using xda app-developers app

Ieatnoobs said:
Mine losses connection when I leave a WiFi network. Also here and there it looses signal so bad I have to go into airplane mode and back to land mode.
Sent from my Galaxy Nexus using xda app-developers app
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Mine is doing the same thing whats going on? How do you fix this problem? Is it ST network issue?

Hmm last time airplane mode didn't work for me. Will try again next time. I also think it happens when I leave wifi.

take out your battery and then restart your phone. if that does not work. check in your network settings and make sure you are on the correct network for your carrier. if that still does not work, go to your local store and see if they can warranty you out a phone or check your settings

GRICKMAAAZ said:
take out your battery and then restart your phone.
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Click to collapse
It's not neccesary to take out the battery, a restart of the phone is enough. It's just an annoying problem.

lesonal said:
Dude mine just started doing this yesterday look at top right of screen shot no signal !!
Sent from my Galaxy Nexus using xda app-developers app
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Ive got the same issue!!!
It started yesterday as well, Ive tried almost everything but nothing works, Im waiting for tuesday to come to go to my carrier store if they can do something for me

IsonNick said:
It's not neccesary to take out the battery, a restart of the phone is enough. It's just an annoying problem.
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I understand that but there has to be fix right? As soon as i reboot the phone it works but it seems like whenever it changes cell towers signals it locks up again. Crazy thing is all the signal bars on my phone are full green, but have no data until i reboot.

Wifi Issues in 4.2.1

Not sure if it's just me, but on my Nexus I am connected to wifi while at work and at home. When the screen turns off so does my data about 10% of the time. When I turn the screen back on it will show just the cell bars (full signal) with no data icon (H, 3G, E, etc.) and no wifi symbol. After unlock it will try and re-connect and eventually does. In my wifi settings I have keep wifi on during sleep set to "always", and wifi optimization turned off (<-- not sure what this does).
Anybody else with this issue?

Yeah I get this issue too after the update...even with WiFi sleep set to never....and the new option for WiFi performance switched off! Any help devs?
Sent from my Galaxy Nexus using xda app-developers app

Same for me, but try this : (this is what i do)
go to wifi settings and turn it on, wait for it to connect then turn it off, then on again.
this solves it for me but i have to do this every time i want to connect to a wifi network

This always happens to me too I just thought it was because of the new wifi-optimization so I never thought twice about it...

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Same
I am having the same problem.

Now that this is buried in Q&A I expect that it won't been seen as much.

Could any deva compare the driver for the WiFi from 4.1 and check the changes using a code compare app? Should be Peru ready if someone can tell me how to get at the code inside the files I could do it..... It might help
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Same problem here, any fix/solution for it?

judging from responses I guess many have tried/failed to find resolution.
in my case, and I THINK it is since 4.2.1 - can't prove it - the reception is just abysmal on my home ap [repeated, one single ap id/login]. nexus 7 beyond about 4 meters from any of the devices gets a flaky connection, will drop, reconnect in the background repeatedly. if I use wifi analyzer on the nexus it shows a "fair" signal at that spot - use it on a better device and of course it shows a better [green] signal .. surprise surprise.
my geriatric Optimus P509, the galaxy s4g, ipad mini, and venerable thinkpad x120e get good signal on the very spot.
I've tried off/on wifi, cache clearing - no sacrificial animals however...
any clues out there?
oh, and as some few others have noted, I get a different signal indication in portrait mode vs. landscape, no matter how my fingers are arranged. and just the act of flipping it into the horizontal will cause a disconnect/reconnect.
everlong81 said:
Same problem here, any fix/solution for it?
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same problem, don't know how to solve. I guess (just guess) it may be relavent to power management, because it often happens at night, when I left the phone untouched for several hours. I think during this long period of time the phone goes into some kind of "power saving mode", which affects the wifi and data connection.

I'm in the same boat, I've got the same problem with mi wifi. Everything works great, except when I turn off the screen and my wifi begins to act crazy turning on/off all by itself.
I've tried latest aokp latest cm 10.1, different kernels but nothing. I'm thinking to go back to 4.1.1 to see will the issue still be there.

Report back if it works good in 4.1.1.

everlong81 said:
Report back if it works good in 4.1.1.
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After flashing back to CM 10.0, everything is working perfect again, no wifi issues at all.
So it's a 4.2.1 issue... Maybe a modem + 4.2.1 issue? Or is this issue specific only for a few devices?
I'm using LF1 modem.
Sent from my Galaxy Nexus using xda premium

I don't have this issue.
Sent from my Galaxy Nexus using Tapatalk 2

akira02rex said:
I don't have this issue.
Sent from my Galaxy Nexus using Tapatalk 2
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That's great! For you...
I have this issue.
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I have the same wifi issue as well. When the phone is asleep wifi will drop and I don't get email notifications. I'm thinking about going back to 4.1 as well.

Try to untick the wifi optimization. Mine one seems ok, without wifi drop after untick it.
Sent from my Galaxy Nexus using xda premium

I'll give it a shot, but I think that I have already tried that.

nickcct said:
Try to untick the wifi optimization. Mine one seems ok, without wifi drop after untick it.
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I tried this too but it didn't helped. Yesterday I've flashed rasbeanjelly and my WiFi worked fine, but today again WiFi drops everytime my GN is in deep sleep.
Don't know what to try or do next...
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Preparing network question!

Everytime I reboot my S3 it has a notification in the status bar 'preparing network'. It hasn't affected internet or texts or anything but it will not go away unless I long press the app in my notification drawer and force stop it. Anyway to make it stop period? I know it has to do that periodically but its never been frozen on the screen before! Any help is greatly appreciated. BTW, I'm on stock mb1 rooted with stock kernel.
Sent from my 'milky' white S3 on the ever-getting-better Sprint network.

I'd backup, then wipe everything. Don't restore any data just setup your phone again and see how it goes from there.
Might be some funky data.
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jdelano said:
I'd backup, then wipe everything. Don't restore any data just setup your phone again and see how it goes from there.
Might be some funky data.
Sent from my SPH-L710 using xda premium
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Well I've already backed up so I guess I'll try factory restoring.
Sent from my 'milky' white S3 on the ever-getting-better Sprint network.

I also am getting this but not after phone reset (that i know of...not really resetting to much)
Mine is happening after phone is in standby/sleep mode for a few mins then i press power to take out of sleep.
I can see that message "preparing network) and during this time my "groove ip" app is not connected but it looks like my wifi is still.
Im not connected to cell service as i dont have any....it does show the cell signal bars but im connected over wifi.
I also have power saving mode disabled.
I do notice my whole noticicafion bar goes blank which is actually all black and when preparing network notification shows i can then see all my regular notifications up there....

Ok I fixed it, turns out when I changed my build.prop to 'Galaxy Nexus' and 'Google' instead of 'Samsung' it borked it. I changed the build.prop back and all is fine again. Weird to say the least :/
Sent from my 'milky' white S3 on the ever-getting-better Sprint network.

It happens to me sometimes and I'm full stock brand new. MB1
Happen at:
Boot (startup)
Checking for software update.
Speed Test Dot Net app.
When it changes from LTE to 3G coverage.
BTW it shows only for a split second. Never hangs or something like that.
Sent from my SPH-L710 using Tapatalk 2

Omar04 said:
It happens to me sometimes and I'm full stock brand new. MB1
Happen at:
Boot (startup)
Checking for software update.
Speed Test Dot Net app.
When it changes from LTE to 3G coverage.
BTW it shows only for a split second. Never hangs or something like that.
Sent from my SPH-L710 using Tapatalk 2
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It's always done it, just never had a notification before. It's the profile updating during network connection. It *should* do it anytime the network is enabled or switches between bands. In older builds you could see it if you went into /settings/about phone/status and toggled airplane mode on and off, under mobile network status it would say connected, then disconnected, then preparing, then connected. It's nothing to worry about it's just like any electronic device connecting to the Internet it takes a few seconds and there's typically a loading dialog while it connects.
☆SoA: Son's of Android™☆
I like to break stuff!

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[Q] Unlocked Note 2 - Mobile data connection drop

Hi all,
I am having problems with my mobile data connection frequently dropping out.
I am using it at home for tethering until my broadband gets fixed, and nearly every hour or so the mobile data connection drops, the green arrow is left flashing and it will reconnect in about 60 seconds.
Its getting really irritating now, sometimes it can be fine for hours, others it will go every 10 mins or so.
I also notice the same while out and about (still in area with top connection).
Does this sound like the issue where the phone is switching between HSDPA and 3G etc, as I don't get the triangle just the flashing green upload arrow.
If anyone has any advice to give i'd be grateful as i'll have to RMA it otherwise.
Phone is NOT rooted, has Jellybean 4.1.2 and is in the queue for the latest 4.1.2 build as far as updates are concerned.
Cheers

Did you tried factory reset?
Sent from Galaxy Note 2 via paid Tapatalk

ForbEx said:
Did you tried factory reset?
Sent from Galaxy Note 2 via paid Tapatalk
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I haven't no. Where would that leave me with regards to settings?
What would I need to set up again if I did that?

*No signal strength after multiple flashes and recoveries

*No signal strength after multiple flashes and recoveries I have flashed multiple Touchwiz and Aosp Roms as well as restored the original stock firmware. (JediX20 and JediMaster + PacMan 4.2.2 and 4.3 + Stock Firmware Samsung 4.1.1 and 4.1.2 and even updated to 4.3 and downgraded back to 4.1.2) Nothing seems to work sometimes when I boot up ill have signal and my phone will work. Sometimes ill make a call while I have 3 signal bars or more and the phone will just be in dialing mode and after 10 seconds or so my signal will cut off and the call will disconnect saying there is no signal or "out of service area" and as soon as it hangs up my service bars reappear. And then there are times where the phone will show no signal strength at all for the whole time. In all instances data will still work. I have flashed and recovered through odin multiple times but I know the issue lies within the software I just dont know where. EFS maybe? I even thought it was in factory mode and downloaded titanium backup and deleted every "Factory Test Mode" I saw. Still no luck and im bout to the point im about to chunk it. Any ideas of why it is doing this? Any help would be much appreciated. A phone aint nothing if the basic functions of call text and web doesnt work.*I have also tried flashing K7 MA4 J2 and UCAMH3 Modems. None seem to help the problem.
Sent from my SAMSUNG-SGH-I317 using xda app-developers app

Possible on the EFS...but that file is really an all or nothing deal...
It is possible to have a bad antenna or radio chip....but I do agree with you on a software fix first...to include a custom APN setup with experimented entries...
I've also heard that arbitrarily bouncing between 4.1 and 4.3 roms does alter the partition structure slightly ...but after looking into the EFS on both frameworks....I've noticed they have the same size and the information is identical...
I wish that I had more help for you....g
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killacam1989 said:
*No signal strength after multiple flashes and recoveries I have flashed multiple Touchwiz and Aosp Roms as well as restored the original stock firmware. (JediX20 and JediMaster + PacMan 4.2.2 and 4.3 + Stock Firmware Samsung 4.1.1 and 4.1.2 and even updated to 4.3 and downgraded back to 4.1.2) Nothing seems to work sometimes when I boot up ill have signal and my phone will work. Sometimes ill make a call while I have 3 signal bars or more and the phone will just be in dialing mode and after 10 seconds or so my signal will cut off and the call will disconnect saying there is no signal or "out of service area" and as soon as it hangs up my service bars reappear. And then there are times where the phone will show no signal strength at all for the whole time. In all instances data will still work. I have flashed and recovered through odin multiple times but I know the issue lies within the software I just dont know where. EFS maybe? I even thought it was in factory mode and downloaded titanium backup and deleted every "Factory Test Mode" I saw. Still no luck and im bout to the point im about to chunk it. Any ideas of why it is doing this? Any help would be much appreciated. A phone aint nothing if the basic functions of call text and web doesnt work.*I have also tried flashing K7 MA4 J2 and UCAMH3 Modems. None seem to help the problem.
Sent from my SAMSUNG-SGH-I317 using xda app-developers app
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Are you really on straightalk like your profile says? Have you checked your APNs? You've been bouncing back and forth I'm wondering what's in there. Sounds like something in there is not happy.

dicksteele said:
Are you really on straightalk like your profile says? Have you checked your APNs? You've been bouncing back and forth I'm wondering what's in there. Sounds like something in there is not happy.
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My apns are fine and have always worked. The problem is not with that but rather signal strength, being able to make and receive calls. Messaging and data work fine.

killacam1989 said:
My apns are fine and have always worked. The problem is not with that but rather signal strength, being able to make and receive calls. Messaging and data work fine.
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My phone has always worked flawlessly until now. The signal can be normal but when I make a call it rings forever. .. the signal drops..my phone says it's out of service area and hangs up. .. and soon as it hangs up the signal bars reappear. .. in that specific order. It had never done that before until recently

killacam1989 said:
My phone has always worked flawlessly until now. The signal can be normal but when I make a call it rings forever. .. the signal drops..my phone says it's out of service area and hangs up. .. and soon as it hangs up the signal bars reappear. .. in that specific order. It had never done that before until recently
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Click to collapse
Well you can try this.
[RIL] AT&T I-317 UCALK7/UCAMC3 RIL Update Packages Collection CWM/TWRP Compatible
http://forum.xda-developers.com/showthread.php?t=2280462
What is RIL:
RIL is like a driver for the modem
Use the ATTI317UCAMC3RILRecovery.zip
Then grab the ATTI317UCAMC3ModemCWM.zip from here
http://forum.xda-developers.com/showthread.php?t=2274854

If a radio/ril package doesn't repair the situation for you...and a complete return to stock fails also....(stock contains radio/ril )...
Then you should consider a hardware repair...
The note 2 had antenna issues on some devices...g
Sent from my SGH-I317 using XDA Premium 4 mobile app

no signal
gregsarg said:
If a radio/ril package doesn't repair the situation for you...and a complete return to stock fails also....(stock contains radio/ril )...
Then you should consider a hardware repair...
The note 2 had antenna issues on some devices...g
Sent from my SGH-I317 using XDA Premium 4 mobile app
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Greg,
Do you know where I can get details about the antenna issues. I searched several forums that pointed to the usb flex. I just replaced mine and still have the same problem of weak signal and constant signal drops.
Thxs

Thanks man ill try this out. Isnt there a way to just wipe the efs, system,data, dalvick, cache in TWRP and start fresh?

Do "NOT" wipe your EFS FOLDER...and do "NOT " re-partition your device in Odin either...
Simply use TWRP and wipe system ...data....dalvik...and cache...
Also ....you can wipe your internal storage as well if your important items are stored on the external SD....(photo's etc.)..
And as for the antenna question ...just Google it....g
Sent from my SGH-I317 using XDA Premium 4 mobile app

I was poking around in my efs folder and went to Factory Apps and found a factory mode script. I opened it up in RB text editor and found that the script said on so I assume that it being on must have had something to do with the call feature. I changed the script from on to off and saved it. Soon after I tried making a bunch of calls its been working flawlessly but in exchange the lockscreen will not show up nor does the option to reboot/power off/airplaine mode shows up. Im going to Keep testing the calls in the meantime.
Sent from my SAMSUNG-SGH-I317 using xda app-developers app

Im experiencing a problem nearly identical to yours. I have an i317 unlocked using a Tmobile SIM. Everything was working fine until I flashed a rom (I believe I accidentally flashed a rom with a Tmobile radio which boot looped the phone). After fixing the bootloop and flashing the cyanogen mod rom, I started experiencing the frequently dropped signal.
I have downgraded and gone back to stock several times which has not fixed the problem
After reading this thread I changed the factory mode script to off, but it doesn't seem to have affected the radio performance.
I remember reading that the partition could possibly be corrupted in a bad flash. What is the best way to reformat the partion?
Any help greatly appreciated

Did you reboot the phone afterwards?
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Yea still no luck. But after about 3 days and a crapload of flashes I ended up flashing jedix20 and added the alexander theme..which suprised the hell out of me...the stock jedi had less signal bars like 1 or 2. I flashed alexander theme and my bars are from 2-4 with 4 being the best. Everything seems to be working. I had also did a test and made sure that my Network in setting was registered to the HOME network. That may have played a factor as to why the network wouldnt work even with signal bars. I flashed JediMasterX2 and ran across an issue like that. I flashed the att carrier files and it didnt work. Then I flashed the 7105 version and checked the Network operators and searched for a network. It pulled up AT&T and Verizon and when I chose AT&T and it registered my phone everything started working. I dont really like messing with the system files but I investigated the Jedimaster zip and looked under Jedi> carrier> att> and opened up the cscversion.txt under rb text editor and it showed an incorrect version. I317ATTAMA4....which im assuming was supposed to be I317ATTUCAMA4. Also under the SW Configuration. Xml the csc version was still the same. AMA4 it may be nothing but I would have thought it would have needed to match up. Ill have to look into it some more. I really want to update but hell idk. Might be done trying to flash roms on this device if everything works right
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Would the phone having factory test and factory mode on the phone affect it any. I seem to have 2 factory mode apps with one being 560kb and the other 84kb. I don't know if those could affect the signal performance
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Is your phone working now. Do you have details on what you did exactly. Thxs
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Sherio1000 said:
Is your phone working now. Do you have details on what you did exactly. Thxs
Sent from my SAMSUNG-SGH-I467 using XDA Premium 4 mobile app
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Tbh. I honestly never got it to work right. I tried for months to get it to work right and to no avail. I ended up selling it and getting the note 3.
Sent from my SM-N9005 using XDA Free mobile app