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[Q] Network connection cuts out - Not registered on network

I have read a few threads about this issue, but none of them seem to be the same exact problem..
Right now I am running ParanoidAndroid 2.15 with InstigatorX 6.3.6 kernel.
When I first noticed the problem I was on PA 2.13/IX 6.3.6 I believe and I was using the UCLF6 modem.
My network connection was fine until one day I noticed that I had 0 connectivity and when I tried to make a phone call it said I wasn't registered on the network.
Sooo the issue..
My network connection constantly shows that I am not connected to the ATT network, sometimes the network is out for a good 5 minutes or so before it connects to it again. When it does connect to the network it usually shows up as connected to the Edge network..once in a while it will show 3g; I used to have full bars of 4g/hspa.
After a few minutes go by, the network connection cuts off and I am again once disconnected from the network.
From the time I had no problem with my connection to when it started disconnecting from the network I have no idea what happened.
Yes, I do flash ROMs a lot, but this seemed to happen over night. (I had not messed with my ROM for a good while and then BAM my network blows 'all of a sudden')
Things I have tried..
I have tried different roms, different modems, I have tried the whole airplane mode deal, tried pulling the batter, I have reverted back to stock using Odin and the stock ROM file. My IMEI number shows up correctly, my settings are default as far as allowing data connections ect.
I am not sure if there is anything I can do besides call up the warranty department and try and get a new phone, but I wanted to ask here before I did that.. I've already returned my phone like 2 or 3 times since February lol.

Try getting a new SIM card from AT&T. There is a $10 fee for it, but I had a similar problem and this fixed it for me. My phone would lose service and say "No SIM card inserted" then I would hit restart and everything would work except phone calls. I had to remove the SIM for a few minutes and put it back in in order to make or receive calls.
Sent from my SGH-I727 using xda app-developers app

Not sure if this will help or not, but in the past I have had AT&T "re-initialize" my phone on their end and it has fixed some connectivity issues.
Good luck!

Well dang, I was wishing and a praying I'd come back to some good news lol. Oh well

mtu_husky said:
Not sure if this will help or not, but in the past I have had AT&T "re-initialize" my phone on their end and it has fixed some connectivity issues.
Good luck!
Click to expand...
Click to collapse
happened to me today. att rep told me i need ti turn gps on all the time bulls***!
Sent from my SAMSUNG-SGH-I727 using xda premium

Backup and odin back to stock I727UCLF6 and see if the problem goes away. If yes then its possible you need to look for the AT&T LTE APN settings.

askpcguy said:
Backup and odin back to stock I727UCLF6 and see if the problem goes away. If yes then its possible you need to look for the AT&T LTE APN settings.
Click to expand...
Click to collapse
I've tried using Odin to stock ICS and also GB, but the problem still occurs =\

Did you unlock it?
Hey,
Did you unlock the phone? I have a similar issue, having had tried many different modems kernels and ROMs including the stock ones. It turns out that if the phone is unlocked then it will lose connectivity to lte and 3g. I get edge sometimes and one bar max but I cannot make a call out ever.
Unlocked it as I was travelling in the states and now Roger's says I voided my warranty by unlocking it. Tried a different sim card but I am only able to text right now, no calls. The only silver lining is the big three are starting to lower their prices a bit to compete with new competitors.Then again they make budget brands like koodo and public mobile to directly compete with the new entrants so unless the crtc steps in looks like we'll always get gouged.

canadianclub said:
Hey,
Did you unlock the phone? I have a similar issue, having had tried many different modems kernels and ROMs including the stock ones. It turns out that if the phone is unlocked then it will lose connectivity to lte and 3g. I get edge sometimes and one bar max but I cannot make a call out ever.
Unlocked it as I was travelling in the states and now Roger's says I voided my warranty by unlocking it. Tried a different sim card but I am only able to text right now, no calls. The only silver lining is the big three are starting to lower their prices a bit to compete with new competitors.Then again they make budget brands like koodo and public mobile to directly compete with the new entrants so unless the crtc steps in looks like we'll always get gouged.
Click to expand...
Click to collapse
Unlock it as in use it with a different carrier right? No I havent done that, just rooted it.
I've never had any problems with my connection until this JB rom I had on it =\

But have you verified the imei shown in settings > status is the same as what is on the sticker under the battery?
Sent from my SGH-I727 using xda premium

askpcguy said:
But have you verified the imei shown in settings > status is the same as what is on the sticker under the battery?
Sent from my SGH-I727 using xda premium
Click to expand...
Click to collapse
Yes, they are the same :crying:

Are you able to rule out the sim card as the problem?
Sent from my SGH-I727 using xda premium

askpcguy said:
Are you able to rule out the sim card as the problem?
Sent from my SGH-I727 using xda premium
Click to expand...
Click to collapse
I'm not 100%, but I don't have any warnings about my SIM card or anything

Same boat
I'm having the same issue with my Galaxy Note 717r on Canadian carriers Rogers and Telus
I keep getting the Error 'Not registered on Network'
On Rogers, if I select GSM only, it will register on the Network and connect with EDGE speeds
It has been Carrier unlocked at some point but it was working that way for a while. You can check by using this service code: *#7465625#
Tried multiple SIM cards that work with other phones.
Verified that the IMEI number matches what is on the sticker *#06# Rogers told me if I can make calls on the GSM network than the IMEI isn't blocked. Don't know if that's true but it makes sense.
Went back to stock everything (Modem, CSC, ROM) then I upgraded to ICS OTA.
Enable SIM lock, Disabled SIM lock.
How do you know that carrier unlocking blocks you on the 3G/LTE networks? Can the carrier be relocked?
I've got another 717r coming to me. I think I'll try backing up the EFS folder and restoring it on this phone just to verify it's not corrupt or a blocked IMEI.

pot srarnewi
tweebs said:
I'm having the same issue with my Galaxy Note 717r on Canadian carriers Rogers and Telus
I keep getting the Error 'Not registered on Network'
How do you know that carrier unlocking blocks you on the 3G/LTE networks? Can the carrier be relocked?
Click to expand...
Click to collapse
I'm not sure about that one.
But what ROM do you use? It seems like this only happens with people who have JB ROMs..it looks like..
I just called ATT , they did some kind of wireless number reset, nothing happened.
They are going to send me a new SIM card which I can test and see if that fixes the problem, but I'm not going to hold my breath though.

I just called ATT , they did some kind of wireless number reset, nothing happened.
They are going to send me a new SIM card which I can test and see if that fixes the problem, but I'm not going to hold my breath though.
Click to expand...
Click to collapse
I am having the same issue. Did you receive the SIM card and did it fix it?

Try going to retail at&t store and show them. Get you a new device.
Sent from my SGH-I727 using xda premium

No Service or connection, Intl travel

Hey all,
having a huge issue
I am in Canada for work and havent had a problem before, usually i turn off mobile network just before the US canada boarder and will roam and only use my phone to text. Well I did the same thing and turned it off while it was using GPS which i have done before as well, but after i then realized the phone get saying it was "refreshing SIM card" and it would not pick up a signal. I tried reflashing, wiping, different rom and kernel, still nothing. I am wondering if my SIM took a crap or if there is something i am missing. Can anyone help?

Franzie3 said:
Hey all,
having a huge issue
I am in Canada for work and havent had a problem before, usually i turn off mobile network just before the US canada boarder and will roam and only use my phone to text. Well I did the same thing and turned it off while it was using GPS which i have done before as well, but after i then realized the phone get saying it was "refreshing SIM card" and it would not pick up a signal. I tried reflashing, wiping, different rom and kernel, still nothing. I am wondering if my SIM took a crap or if there is something i am missing. Can anyone help?
Click to expand...
Click to collapse
What ROM are you on?

jtdo said:
What ROM are you on?
Click to expand...
Click to collapse
Eclipse TW, but tried 3 other roms on my SD crad, same thing.
think i got it working, i got a signal now. had to do a factory reset from the phone itself and not through TWRP. Just got to see what happens now when i cross back into the states...

Unlocked T-Mobile Data and Reception Dropping in and Out

I picked up an unlocked T-mobile G5 and I'm using it for AT&T... The rep at the store applied the APN setting for ATT but I noticed after I got a new SIM installed and went home the reception and data connection started dropping in and out.
Basically, when the phone is sleeping and then I wake it starts searching for network then gets reception then get a signal for a couple mins then drops again and searches. Since it's a T-Mobile phone on an ATT network is there certain settings that I need to turn off like VoIP, WIFI calling etc? Any ideas?

Wipe out all existing APNs and start from scratch? Use the NXTGENPHONE APN. I'm using an unlocked T-Mobile H830 LG G5 on AT&T and I have no problems. My sister's Nexus 6 uses the same APN no problems either.
https://www.att.com/esupport/article.html#!/wireless/KM1062162

smartnphone said:
Wipe out all existing APNs and start from scratch? Use the NXTGENPHONE APN. I'm using an unlocked T-Mobile H830 LG G5 on AT&T and I have no problems. My sister's Nexus 6 uses the same APN no problems either.
https://www.att.com/esupport/article.html#!/wireless/KM1062162
Click to expand...
Click to collapse
So I followed your steps.. I wiped all existing APNs and entered the APN setting in the link you provided and used the NXTGENPHONE APN but I couldn't get data but just had reception to make calls. So I changed the name to AT&T and the APN name to phone and I get data and reception but it still drops in and out.
I went to ATT to see what they could suggest but the only thing they offered was maybe a faulty SIM card and switched it out but it's still doing the same thing... Has anyone experienced this? Should I do a factory reset maybe? If I do that, I won't lose SIM unlock right?

sguerra923 said:
So I followed your steps.. I wiped all existing APNs and entered the APN setting in the link you provided and used the NXTGENPHONE APN but I couldn't get data but just had reception to make calls. So I changed the name to AT&T and the APN name to phone and I get data and reception but it still drops in and out.
I went to ATT to see what they could suggest but the only thing they offered was maybe a faulty SIM card and switched it out but it's still doing the same thing... Has anyone experienced this? Should I do a factory reset maybe? If I do that, I won't lose SIM unlock right?
Click to expand...
Click to collapse
I was going to suggest a factory reset as a last resort. You won't lose the sim unlock; it's permanent unlock.
Troubleshooting is the name of the game and you'll have to keep having to try potential solutions until it's fixed.
Hopefully it's not a hardware issue with the radio or you'll have to swap it out and reunlock it all over again.

are you on 10A or 10D?
10D seems to improve the radio... but if you wan root/twrp make sure you do all that on 10A first before upgrading to 10D.
also, have you tested the phone in different areas? or just at your house and immediate area? perhaps it's just an issue in specific locations? what if you drive across town or something?

smartnphone said:
I was going to suggest a factory reset as a last resort. You won't lose the sim unlock; it's permanent unlock.
Troubleshooting is the name of the game and you'll have to keep having to try potential solutions until it's fixed.
Hopefully it's not a hardware issue with the radio or you'll have to swap it out and reunlock it all over again.
Click to expand...
Click to collapse
Performed a factory reset and issue is still there but slightly improved but I need to test it more... Basically, when I wake the phone it searches for network (not all the time but here and there) then locks a signal..

autoprime said:
are you on 10A or 10D?
10D seems to improve the radio... but if you wan root/twrp make sure you do all that on 10A first before upgrading to 10D.
also, have you tested the phone in different areas? or just at your house and immediate area? perhaps it's just an issue in specific locations? what if you drive across town or something?
Click to expand...
Click to collapse
In on 10D.. Yeah I tried it in different areas and driving when I'm art a stoplight I can see it searching for network.. I switched the SIM card and did a factory reset any other suggestions?

Is your Network mode set to GSM/WCDMA/LTE auto? If it's not area specific it might be hardware related.
How did you get the 10D update on AT&T btw?

smartnphone said:
Is your Network mode set to GSM/WCDMA/LTE auto? If it's not area specific it might be hardware related.
How did you get the 10D update on AT&T btw?
Click to expand...
Click to collapse
Yes, my network mode is set to that setting. The person I purchase this phone from had T-Mobile and updated before they sold it to me.

sguerra923 said:
Yes, my network mode is set to that setting. The person I purchase this phone from had T-Mobile and updated before they sold it to me.
Click to expand...
Click to collapse
Last thing to try is Mobile networks>Network operators>Search networks. Maybe manually choosing one might help? Enable Data Roaming?
Could be a hardware issue if not software.

smartnphone said:
Last thing to try is Mobile networks>Network operators>Search networks. Maybe manually choosing one might help? Enable Data Roaming?
Could be a hardware issue if not software.
Click to expand...
Click to collapse
Yeah, I tried that too.. Got back from Tmobile and they said that another person experienced the same issue couple weeks ago and they said that some G5s that are unlocked and used on different networks are still trying to jumping back on the tmobiles phone network hence my phone searching signals off and on...

Just wanted to give another confirmation that the LG-H830 works perfectly on AT&T (H83010D [BL,modem,system], rooted, unlocked). I gave up on Verizon and my fiancé now uses it on AT&T. She loves it!

Geez.. I got scammed. The person looks like they file a insurance claim on the phone so my ESN is blacklisted! Great! Lesson learned the hard way. Any suggestions what I can do? I saw that people are buying bad ESN phone on ebay as long as I post that it's a bad ESN.

OP, I had the exact same problem on T-Mobile after doing a temporary unlock. I took it to a T-mobile store and they tried swapping the SIM but that didn't help so they did a warranty replacement. Two days later I had a new phone and everything works again. I didn't (and won't) try to SIM unlock it again.
Sent from my LG-H830 using XDA-Developers mobile app

I have heard of people getting past blacklist. Think you can pay to fix it.
---------- Post added at 11:14 PM ---------- Previous post was at 11:13 PM ----------
Are you guys not changing the apns xml file????? Or enable roaming and setting rat to global?

jhasty01 said:
I have heard of people getting past blacklist. Think you can pay to fix it.
---------- Post added at 11:14 PM ---------- Previous post was at 11:13 PM ----------
Are you guys not changing the apns xml file????? Or enable roaming and setting rat to global?
Click to expand...
Click to collapse
I did some research online on blacklist repairs but do you or can anyone give me some recommendations on it? Sucks cause even if I get it repaired I wondering if I still will have issues with the reception..
Anyone tried this site? http://www.imeifix.com/

I just tried the sim unlock as well. I'm a tmobile customer so I really didn't have a reason to do it. Just wanted to see if it would unlock.
Well it said it could not be unlocked and I, out of dumb curiosity tried the temporary unlock. It worked and said it is unlocked until August. I think roughly 30 days after I did it.
Well, later that day or the next my phone started doing the same exact thing. Signal dropping and searching. Furthermore though, I woke up to a warm phone today. Same as it gets when doing lots of app updates. I unplugged it from the charger and watched the battery drop 4% in only 15 minutes of standby (screen off, not using the phone).
I just flashed it back to stock and relocked the boot loader and will see if it fixed it. Was running rooted 10d when this happened.
I'm starting to think that sim unlock app is evil or something. I haven't put my sim card back in as of yet but will update if it starts acting up when I do.
Possible explanation?:
I noticed a T-Mobile diagnostic app try to gain root access during the weirdness which I had never seen before. Maybe the sim unlock gains a sudo root to do the unlock but on a rooted phone with a non stock root manager causes the unlock app to endlessly loop trying to gain access and thus cause a warm phone and signal dropouts? Just a hunch but would be interested to see what others think.
*** Ok so quick update, I put my tmobile sim back in and the signal is dropping in and out again. The phone worked fine before I tried the unlock. This is so uncool.
Sent from my LG-H830 using XDA-Developers mobile app

I think I may have isolated the cause. I disabled the device unlock app in app settings and rebooted. Since then I haven't noticed the signal drop out.
EDIT: Yeah, that's a big nope. I'm still experiencing the problem after a total wipe and reflashing using LGUP refurbish mode. It's still dropping in and out, sometimes three times per minute. +1 to never use device unlock app.
I'm on stock unrooted 10d btw.
Oh, and the same SIM card works just fine in my older phones.
Sent from my LG-H830 using XDA-Developers mobile app

For what its worth, Att doesn't use the exact same bands as t Mobile....you might want to research some threads on the Att LG G5.

No service and mobile network. Really no fix? :(

Hii... Have been searching forum but seems like no one has the answear
Galaxy s7 european version. Phone worked perfectly for 4 month and then suddenly I lost mobile network and service Tried hard reset, network setting reset ect. nothing helps Put simcard in different phone - everything is ok. I red that this problem most likely can t be fixed by software... Is that true? Can I try something else to fix this? Whats the cause?
Thanks for your time

Still got an IMEI number when you call *#06# ?

Yes IMEI and SN pops up. What does it mean?

samsungremote said:
your phone got blacklisted
Click to expand...
Click to collapse
What does that mean? :/

stepanooo said:
What does that mean? :/
Click to expand...
Click to collapse
Call your carrier and ask them if it has been blocked

*Detection* said:
Call your carrier and ask them if it has been blocked
Click to expand...
Click to collapse
I guess tomorrow I will return the device. Bought it from official carrier. Doubt it s blocked. Strange that no one has solution to this problem yet because there are quite a few similar posts online. :/

stepanooo said:
I guess tomorrow I will return the device. Bought it from official carrier. Doubt it s blocked. Strange that no one has solution to this problem yet because there are quite a few similar posts online. :/
Click to expand...
Click to collapse
Hey there. I have the same issue with Vodafone Sim card AUSTRALIA. phone just stopped working all of a sudden. Why would they blacklist it? Other sim cards work on the phone.

stepanooo said:
Hii... Have been searching forum but seems like no one has the answear
Galaxy s7 european version. Phone worked perfectly for 4 month and then suddenly I lost mobile network and service Tried hard reset, network setting reset ect. nothing helps Put simcard in different phone - everything is ok. I red that this problem most likely can t be fixed by software... Is that true? Can I try something else to fix this? Whats the cause?
Thanks for your time
Click to expand...
Click to collapse
have you been able to resolve your issue? what was the fix?

Has anyone got any solution of this? It's been quite a long with this issue, I've searched a lot of topics but no solution.

I have the same problem. Phone don't see simcard somehow. Flashed latest original firmware works for 1 min. Pull out trace with sim insert it again works for 2 min and stops working. When it works for small amount of time i think IMEI its not blocked and almost sure its software issue. Yesterday flashed different roms and CSC and modems no luck. SimCard changed for new one. Have someone some clue what to do ? I can provide logs if needed.
After instaling Samsung Phone Info app from market gsm wen't back online. Probably a coincident but when I go to Hardware screen ther was no modem model. I tap it few times. Close apk run it again modem went show itself after a while GSM signal is back.
After reboot no signal again. Then i make magic with phone info apk again and signal want back.
This apo make some sort of device discovery and reset modem device / driver or this is pure luck.

My friends One cant make calls anymore?

So me and my friend swapped our Ones because mine had a broken aux port and his was fine, but his casing is pretty battered. So my phone which is now his, its been fine for a few weeks but a few days ago, the network has been playing up. He cannot make calls, but can send texts. But, in network settings, no networks appear when you go to select one. The APN settings are correct, signal is a bit hit and miss, sometimes its there, and sometimes its there but cannot connect to the internet. WiFi works fine. I also tried swapping SIM cards and the same issues were happening with my SIM or his SIM.
It was running Sultan's CM13 ROM with the "firmware_fixed" firmware/radio. I thought maybe something had gone wrong so I then flashed Sultan's Lineage OS and it is still having the same problems. I've tried a full wipe and factory reset, no luck.
Does anyone have any suggestions on how to fix it? or could it be a hardware issue?
Thanks,
donk165

donk165 said:
So me and my friend swapped our Ones because mine had a broken aux port and his was fine, but his casing is pretty battered. So my phone which is now his, its been fine for a few weeks but a few days ago, the network has been playing up. He cannot make calls, but can send texts. But, in network settings, no networks appear when you go to select one. The APN settings are correct, signal is a bit hit and miss, sometimes its there, and sometimes its there but cannot connect to the internet. WiFi works fine. I also tried swapping SIM cards and the same issues were happening with my SIM or his SIM.
It was running Sultan's CM13 ROM with the "firmware_fixed" firmware/radio. I thought maybe something had gone wrong so I then flashed Sultan's Lineage OS and it is still having the same problems. I've tried a full wipe and factory reset, no luck.
Does anyone have any suggestions on how to fix it? or could it be a hardware issue?
Thanks,
donk165
Click to expand...
Click to collapse
Try flashing other firmwares as well.

Mr.Ak said:
Try flashing other firmwares as well.
Click to expand...
Click to collapse
I've tried flashing the idprophecy's c1_11_00006 firmware , the stock 0241 modem and also the firmware_fixed one. All of them are doing the same thing, the main issue is that I get an error while searching for networks. I can call my network operator's topup number but people cannot call me, it either cannot connect or goes to voicemail.

donk165 said:
I've tried flashing the idprophecy's c1_11_00006 firmware , the stock 0241 modem and also the firmware_fixed one. All of them are doing the same thing, the main issue is that I get an error while searching for networks. I can call my network operator's topup number but people cannot call me, it either cannot connect or goes to voicemail.
Click to expand...
Click to collapse
Are you using the same carrier as your frand does?

Mr.Ak said:
Are you using the same carrier as your frand does?
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Click to collapse
My friend is on EE and I am on Three. Both are different networks, and with both sims, it does the same thing, It cannot find the network. I have tried both sims in the other OnePlus One and it detects the networks with no problem.
I guess the next step would be going back to full stock and see if that works. If that is a no go, I can only assume its a hardware issue

Hi again,
I have tried again to fix this phone but I think I have exhausted all software options. I fastboot flashed all the original stock files, completely went back to stock ROM and the same issues are there. It gets signal, and it says that mobile data is working, but doesn't actually connect if i open the play store etc. I managed to get a call to work for about 5 minutes before the call ended on this phone, but was still going on the other phone which called it. It does allow calls sometimes but they drop out, other times it wont dial at all.
At this point, I can only assume there is some antenna damage or something similar? I did a quick google and worked out that the antenna is on the daughter board on the bottom of the phone, and there is also an antenna wire also. Would it be worth it to buy these replacement parts and see if this would fix the issue?
Thanks

donk165 said:
At this point, I can only assume there is some antenna damage or something similar? I did a quick google and worked out that the antenna is on the daughter board on the bottom of the phone, and there is also an antenna wire also. Would it be worth it to buy these replacement parts and see if this would fix the issue?
Thanks
Click to expand...
Click to collapse
You only need the network antenna,I suppose,but is there any recent activity that could damage hardware in your device?

Mr.Ak said:
You only need the network antenna,I suppose,but is there any recent activity that could damage hardware in your device?
Click to expand...
Click to collapse
Its my friends phone now, we traded. And he said he hasn't dropped it or anything like that. But judging how battered the phone is that he traded me, he might have damaged it and not realized. It had been working fine for me in the 2+ years I had the phone. And after the trade, the phone worked fine for him for a few weeks. Its very weird. I've tried my SIM and his SIM in the phone, both sims work fine in my phone but not his.

donk165 said:
Its my friends phone now, we traded. And he said he hasn't dropped it or anything like that. But judging how battered the phone is that he traded me, he might have damaged it and not realized. It had been working fine for me in the 2+ years I had the phone. And after the trade, the phone worked fine for him for a few weeks. Its very weird. I've tried my SIM and his SIM in the phone, both sims work fine in my phone but not his.
Click to expand...
Click to collapse
I see,so if you believe that there could be a hardware damage,you can go with the network antenna and see if it fares.