[Q] Can't set APN, and other SIM problems - LG Optimus 2x

Hello,
I have problem with SIM card on my phone. I'm using Temasek's CM 10.1, Kowalski kernel, and V20I-EUR-XX baseband. When phone boots, I normally input my PIN, but it doesn't connect to network, I have to go to Mobile networks and Choose operator automatically, then it connects. I can call and send messages normally, but when the call hangs (me or the other side) it says SIM card error (something like that). Also I can't save APN. In APN settings there is nothing, and when I create APN manually, I input everything and press save, but it doesn't stay, APN's remain empty. I use micro-SIM with adapter, because my operator couldn't get me normal SIM at a time. I'm on Croatian provider VIP. Everything normally worked with micro-SIM from Tele-2 provider (although on CM 10, and CM 7, didn't test it on CM 10.1).
Is it related to my SIM card or SW (ROM or baseband)?

mind_challenge said:
Hello,
I have problem with SIM card on my phone. I'm using Temasek's CM 10.1, Kowalski kernel, and V20I-EUR-XX baseband. When phone boots, I normally input my PIN, but it doesn't connect to network, I have to go to Mobile networks and Choose operator automatically, then it connects. I can call and send messages normally, but when the call hangs (me or the other side) it says SIM card error (something like that). Also I can't save APN. In APN settings there is nothing, and when I create APN manually, I input everything and press save, but it doesn't stay, APN's remain empty. I use micro-SIM with adapter, because my operator couldn't get me normal SIM at a time. I'm on Croatian provider VIP. Everything normally worked with micro-SIM from Tele-2 provider (although on CM 10, and CM 7, didn't test it on CM 10.1).
Is it related to my SIM card or SW (ROM or baseband)?
Click to expand...
Click to collapse
Not sure if you read my post, but I think we are having the same issue regarding the APN, etc.
Not been able to solve mine yet, perhaps together we can put out enough info that someone here can offer a solution? I haven't changed the baseband or kernel on their own, only went from stock 2.3.3, to CM10.1, then to CM7.2.
Are you able to remove the SIM PIN? If you remove the SIM PIN from security, are you able to save APN?
Does your phone access data with the native SIM card the phone was originally locked to?

gglobal19 said:
Not sure if you read my post, but I think we are having the same issue regarding the APN, etc.
Not been able to solve mine yet, perhaps together we can put out enough info that someone here can offer a solution? I haven't changed the baseband or kernel on their own, only went from stock 2.3.3, to CM10.1, then to CM7.2.
Are you able to remove the SIM PIN? If you remove the SIM PIN from security, are you able to save APN?
Does your phone access data with the native SIM card the phone was originally locked to?
Click to expand...
Click to collapse
It seems that PIN is already disabled in Settings-Security-SIM card lock settings :silly:
I called my old operator and they told me my phone was sold locked, and new operator told me they can't help because I didn't buy the phone from them. But then how it works now for calls and messages?
I don't have any other SIM with me so I can't test it with my phone. You say going back to CM7 didn't help? I guess I shouldn't try that then.
Maybe flashing stock ICS would? Any other suggestions?

mind_challenge said:
It seems that PIN is already disabled in Settings-Security-SIM card lock settings :silly:
I called my old operator and they told me my phone was sold locked, and new operator told me they can't help because I didn't buy the phone from them. But then how it works now for calls and messages?
I don't have any other SIM with me so I can't test it with my phone. You say going back to CM7 didn't help? I guess I shouldn't try that then.
Maybe flashing stock ICS would? Any other suggestions?
Click to expand...
Click to collapse
I haven't tried stock ICS yet; maybe it would? I will try that tonight.
Mine shows the SIM PIN on, when I try to change it it asks for my old code, which I don't have of course, so I can't remove the security. Been hoping that someone else would have had experience or knowledge of what would cause the problem and have a solution or suggestion to try. The closest I came was on a different forum about a Sony Ericsson phone, but the rooting and flashing procedures are so much different I couldn't see a solution in it, though they suggested flashing the baseband iirc.
HMMMM, now that I read your reply, I can't say with 100% certainty that the phone was unlocked before I rooted and flashed CM10.1.....I had thought it was but perhaps it wasn't, and we are having a more similar issue than I thought. So the glitch, perhaps, is that it was not unlocked, the custom ROM somehow "half" unlocked it, and here we are stuck.
Okay, my only thought then is to take it back to stock everything, the most up to date I can find, then unlock it with code, and see if I can change the APN at that point. If so, I will root it, use My Back Up Root to save settings including APN (just in case so at least I can restore it that way if I can't do it manually, after)flash CM10.1 again or another fabulous custom ROM which is what I really wanted in the first place
I will try that tonight, and post you the results. Let me know if you have any (better) suggestions as well, I'm up to try almost anything at this point. Was hoping to upgrade to this for my daily phone as I'm limping along with a Acer Liquid MT that has seen better days
If anyone has a link to quickly point me towards the latest stock ROM etc. and wants to post here, I would be much obliged Might save this noob a few hours scratching his head to find what is most certainly in front of my nose already, but I digress...
Cheers

New baseband
I just flashed V30A baseband, and it didn't help. We can cross that from the list.

Well colour me confused...and happy?
I just today picked this project up again, about to attempt a different fix, again...*sigh.
Lo and behold, i insert my sim and power on the phone, and it asks me for network sim unlock.....odd because I'd used the phone with this sim before, through all my other testing, flashed different roms, etc. etc. In fact, I've used the phone on this very package, I know because there are sms messages on the phone from using it. Battery pull, remove sim and check, yup sure enough, old messages there. Hmmm...
Insert sim, reboot, asks for unlock code again. Well, what have I got to lose at this point right? As I said before, I THOUGHT I had unlocked the phone before starting this whole debacle, but wasn't 100% certain about it. Searched my email for the code since I always save them, couldn't find it. Well, in for a penny, in for a pound I suppose. Bought a new unlock code, waited for it to arrive. Input new unlock code, unlock successful!!
Reboot phone....waiting for service....(this seems like forever!!! In reality, less that 60 seconds.) Alas, I have service. And now, just to tempt fate, Apps->settings->wireless & networks->more->mobile networks->access point names..........:fingers-crossed:
I can hardly believe my eyes, there it be, Rogers Internet apn selected. It even auto-detected the damn thing!!
I can offer no further insight, I don't believe I physically did anything to arrive at this remedy. But there you go, for my part at least it's solved.

Related

...really need help, 24 hours to go!

Hello everybody, I'm writing you from UK, where I bought a second-hand G1 (absolutely perfect!!! really good). The phone is T-Mobile branded and factory-default cleaned. Once I got it, placed my italian H3G sim inside, and (of course...) it told me that it was locked. I purchased a key (...I know may I could do without it... but very few time to spend, these days) and it was succesfully sim-free. Then I reebot it, and start the acrivation... that doesn' run!!! I insered the correct APN parameters, I also tried with a UK O2 and Vodafone sim, but, problem is that the gsm segnal level (small icon on the top with 4 vertical bars) is not giving signs of life, and it has a small "cross" on the left side. Of course I can't get the registration... I can't get the line!!!! why does it happen??? all the sims are correctly recognized (ask for the pin and the "no sim" messages and icons are off), but no way to go over...
Please, help me in any way, just 1 more day here, then I'll go back to Italy... far from the shop!!!! HEEEEEEEEEEEEELP!!!!!!!!!
If you type:
reboot
and press enter. If the phone reboots you can have a chance, if the phone does not it means its on a updated version which you will have to downgrade. While downgrading i recommend going up to Rooted versions of android. Although you might not need it.
You should look here:
http://forum.xda-developers.com/showthread.php?t=442480
and/or here:
http://forum.xda-developers.com/showthread.php?t=452316
You can get through your problem, if its just the registration. by simply following a few of the instructions in the first link combined with some of the instructions in the second link.
@elmejor: He didn't even mention rooting. His problem is he can't get his phone to associate with the networks on his sim.
@tony_m78: You should probably post what apn settings you are using. Also, this is NOT A DEVELOPMENT ISSUE and should not have been posted in this forum.
thanks gor your answer.... I have been to those links THOUSANDS of times, within yesterday night and today... but I really can't get a solution. I can't go over the "error connecting to server" page :-(
The worst problem is that I really don't have time NOW, but I'll have it at the end of the week; I know I'd get a solution, working on that... but really I can't. But whay do you think about the absence of segnal? is it normal?!?
Tomorrow morning I'll find the way to buy a T-Mobile original sim and try to see what happen. . . . . . but that's strange!!!!!!!! not normal... i insered a correct code (generated from the IMEI), the answer was "unlocked", free for others carriers.... BUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU!!!!!!!!!! :-( tic tac tic tac. . . ..I don't have time!!!!!!!! :-( nobody experience this strange problem?!?
jashsu said:
@elmejor: He didn't even mention rooting. His problem is he can't get his phone to associate with the networks on his sim.
@tony_m78: You should probably post what apn settings you are using. Also, this is NOT A DEVELOPMENT ISSUE and should not have been posted in this forum.
Click to expand...
Click to collapse
...oooooops... really sorry, I was wrong. Can you link me to the correct place??? I'll move there immediatly...
jashsu said:
@tony_m78: You should probably post what apn settings you are using.
Click to expand...
Click to collapse
...I don't think the problem is the APN, I set the correct one (from Wiki) for H3G Ita and for O2 UK (these are the sim I tried with); the problem is that the segnal is ZERO, like the sim is not present... BUT IT IS, it ask me for the pin and accept it....
Can you manually select the network to connect to? Settings>Wireless controls>Mobile networks>Operator selection
Are you sure radio is working on this phone? Maybe it has some physical problems (like bad gsm chip)... Or - maybe you have sim cards not acceptable in UK.
Try with T-mobile sim first. If not working:
I would try to factory reset device some times, if it don't help I would try to reflashing it (firmware and radio). But in your case I think you should ask about this situation in shop where you bought it (if you have warraty) first.
Data plan?
I had a similar problem when I got my APD1 phone in the US. When I returned to the UK, I put in my Tesco SIM and the phone signal strength icon had an 'x' indicating not connected or no signal. Eventually I used my home wifi to activate the phone. After the phone was activated, the same SIM was able to connect and the signal strength icon worked normally.
BUT, it turned out that all I probably needed to do was to have a SIM with a data plan (which mine didn't at the time) <<BLUSH>>
Have you confirmed that your SIM has data turned on?
Of course ensuring that the APN settings are correct is also necessary. (But it sounds like you did that)

[Q] Any software that would mess up modem to prevent signal?

Before I buy another used Captivate to swap motherboards, I'd like to know if there's anything else I should look at.
Scenario: Bought used Captivate with bad USB port and running CM9 Beta. Once I finally got my SIM card, I had no network signal (couldn't even find any operators when you search for them). Redid the APNs multiple times though those seem to be for Internet and MMS rather than cell. Wifi works fine. Flashed to CM 9.1 stable. No difference. Verified phone is unlocked. Verified IMEIs match. Verified baseband was listed. Verified my phone # is listed. Flashed to CM 7.1. No difference. I wanted to flash to stock but can't because Mobile Odin won't work with CM's partition layout. Thus, it seems I am stuck with CM or MIUI.
Is there anything in efs or another system directory that could prevent me from getting a signal?
topshot said:
Before I buy another used Captivate to swap motherboards, I'd like to know if there's anything else I should look at.
Scenario: Bought used Captivate with bad USB port and running CM9 Beta. Once I finally got my SIM card, I had no network signal (couldn't even find any operators when you search for them). Redid the APNs multiple times though those seem to be for Internet and MMS rather than cell. Wifi works fine. Flashed to CM 9.1 stable. No difference. Verified phone is unlocked. Verified IMEIs match. Verified baseband was listed. Verified my phone # is listed. Flashed to CM 7.1. No difference. I wanted to flash to stock but can't because Mobile Odin won't work with CM's partition layout. Thus, it seems I am stuck with CM or MIUI.
Is there anything in efs or another system directory that could prevent me from getting a signal?
Click to expand...
Click to collapse
I've been with you on another thread so I know for a fact you've tried all that stuff. But I don't recall did you ever try to flash an new or different modem? If you haven't or just want to try a new one I attached the one I use. Or I can get you the link to a page with a whole lot of others to choose from.
Other than trying a new modem I'm at a loss as to what it could be besides hardware at this point. Btw were you ever able to test your sim card in another phone to make sure it's functioning? Or do you know anyone with an att sim that you could test your phone with?
Things you could try:
1. Turn the flight mode on and then turn it off and see if that helps.
2. Open the phone and see if the antenna's contact points are okay.
3. Open the nv_data.bin in efs directory and see if the value at the offset(you can search for the exact value) that stores the network lock flag is 00. If it is 01 then it is still locked. I know you checked for the lock already but it never hurts to double check. You could also take a look at nv.log and see if there is anything there at the end that might be helpful. You could also check for lock by dialing *#7465625#.
m1batt1 said:
Other than trying a new modem I'm at a loss as to what it could be besides hardware at this point. Btw were you ever able to test your sim card in another phone to make sure it's functioning? Or do you know anyone with an att sim that you could test your phone with?
Click to expand...
Click to collapse
My next move was to flash some other modems actually, but I may wait until after tomorrow (see below). I tried to swap with my SIL who is on the same service but her phone takes the micro SIM. I'll try again Wed night with another choir member that has an ATT S2 I think.
uhm said:
Things you could try:
1. Turn the flight mode on and then turn it off and see if that helps.
2. Open the phone and see if the antenna's contact points are okay.
3. Open the nv_data.bin in efs directory and see if the value at the offset(you can search for the exact value) that stores the network lock flag is 00. If it is 01 then it is still locked. I know you checked for the lock already but it never hurts to double check. You could also take a look at nv.log and see if there is anything there at the end that might be helpful. You could also check for lock by dialing *#7465625#.
Click to expand...
Click to collapse
1. No help.
2. Where are the contact points? I've not found any schematic or disassembly instructions for this phone. I can see the external antennae connector, of course.
3. That was how I verified it was unlocked. All the bits in the appropriate area were 00. I'll have to look at the log file.
How would I dial any service code with no service? It tells me "mobile network not available" once I hit the Phone button.
New Info
I'm really hoping this is the answer to all my headaches the past several days trying to figure out why this phone won't get service. I just spent the past hour on the phone with my OLD carrier trying to re-activate my OLD phone with a different number to give to my son. We had to jump through a bunch of hoops because my old line was still "suspended" because of the port order. It is due to be "deleted" tomorrow. So even though my NEW carrier said activation was complete and my OLD phone stopped making and receiving calls 8 days ago, could the fact my number has been "suspended" be the reason I can't see any GSM networks?
Sadly my SIM worked in another phone but his didn't in mine.
Looks like I have a mini netbook.
topshot said:
Sadly my SIM worked in another phone but his didn't in mine.
Looks like I have a mini netbook.
Click to expand...
Click to collapse
Any luck changing modems?
Sent from my SGH-I897 using XDA
m1batt1 said:
Any luck changing modems?
Click to expand...
Click to collapse
I flashed back to CM 9.1 and then flashed in XXJVU - 12/28/2011
are you getting a good signal strength? that would veify antenna is okay.
Sent from my SAMSUNG-SGH-I897 using xda app-developers app
laughingT said:
are you getting a good signal strength? that would veify antenna is okay.
Click to expand...
Click to collapse
I'm not getting ANY signal. It always shows -110 dbM or less and 0 or 1 asu. The seller said the GPS worked fine, but I don't get a lock on that either (but maybe you need to "fix" the GPS with each ROM flash?). I've only been concerned with cell service at this point.
I'm going to pick up another Captivate in another hour. I'd like to root and unlock it right there to make sure it works, but don't think I'm that good yet to do quickly and safely. Assuming it's running KK4, the Easy Root pgm seems simple enough to root. May also try SuperOneClick.
For unlocking, I'd hoped to use Galaxy_S Unlock, but couldn't figure out how to get it onto my micro SD card to load onto the other phone.
The "new" Captivate works. It came with KK4 and a good USB port. I'll flash something onto it soon once I learn how to properly back up everything.
glad your new one works.
re: old phone gps. i think you may need to edit gps.conf in etc folder to set gps mode to standalone, rls the gps wants a network connection. in standalone mode, expect a v long time to lock, like 15 minutes.
Sent from my SAMSUNG-SGH-I897 using xda app-developers app
topshot...
While u r on kk4 see this post for gps fix... http://forum.xda-developers.com/showthread.php?p=19422197.
Sent from my SAMSUNG-SGH-I897 using xda premium
If you start the phone without a sim card in it, does it detect its absence and vice versa too? If that functions properly then another possibility could be that the IMEI of the phone might be blacklisted. It might have been reported as stolen. You could call your carrier to find that out.
uhm said:
If you start the phone without a sim card in it, does it detect its absence and vice versa too? If that functions properly then another possibility could be that the IMEI of the phone might be blacklisted. It might have been reported as stolen. You could call your carrier(AT&T I suppose) to find that out.
Click to expand...
Click to collapse
Yes, it detected whether a SIM was in it or not. When I had signed up for the new service it had said the IMEI was OK. I guess that doesn't mean it stayed that way. I would think that would just prevent you from accessing the service, not prevent you from detecting a signal at all. When I picked up the second used Captivate, his SIM card had been deactivated, but it still showed it was getting a signal.
topshot said:
Yes, it detected whether a SIM was in it or not. When I had signed up for the new service it had said the IMEI was OK. I guess that doesn't mean it stayed that way. I would think that would just prevent you from accessing the service, not prevent you from detecting a signal at all. When I picked up the second used Captivate, his SIM card had been deactivated, but it still showed it was getting a signal.
Click to expand...
Click to collapse
Once I had my efs folder deleted while flashing a rom and my IMEI defaulted to some value and it showed no signal at all. I checked IMEI and realized it was a different one and that led me to look at the efs. Once I restored the efs folder from my back up, all was fine again. Therefore I think if your IMEI is blacklisted it could happen and hence made that suggestion to call your carrier. Your carrier might also be able to tell you if your phone made any attempts to register on their network or not.

[Q] SIM card PIN stuck on after cm10

Newbie here to the forums, thanks to all who contribute; a magnificent effort by all and it's much appreciated :good:
My question is this; I have an O2X native to Fido Canada. I had unlocked the phone while on stock firmware. For a bit of fun I decided to try updating the phone with CM10.1. All went well (thanks in no small part to the guides in these forums,) but found the nightly version was giving me very poor battery performance. At the same time I used the phone briefly with my Rogers sim card. Calls and sms of course not a problem. But I tried to input the Rogers APN for data support, and I found it wouldn't save the new APN. Didn't think too much of it because I was going to downgrade to a stable version of CM anyways.
I downgraded to CM7. Fun and easy, happily going along I thought it was time to set the Rogers APN; again I couldn't save.
I downloaded Tweeker MMS app to automatically set the APN, what a great concept!!! However, it gave me an error saying I had no SIM installed and no gsm connectivity. Hmmmmm...
After some other playing around and scouring Google for answers, I came across the SIM PIN in settings-location and security. It shows that SIM PIN is set, though I've never had one. Even without a sim installed, it was asking for the PIN.
I tried a different sim without a PIN set, same thing.
Tried a factory wipe/reset. Same thing.
Tried a different ROM, revert to stock, uprade, downgrade. Same thing.
No matter what I do the Security is always set to have the SIM PIN, but it never asks me to put one in. It will not, however, allow me to set a new APN while this setting is there. Any attempts at changing the setting just result in "incorrect PIN".
Is anyone out there familiar with this glitch? Is it a baseband issue? Kernel? Poltergeist? Evil Gnome?
Any suugestions would be appreciated :fingers-crossed:

SIM Card problem (two verifications)

I have recently managed to install resurrection remix 5.0.2 on my Xperia SP and it works very well except for one major thing, sim card.
When I start my phone I will get a prompt to insert my pin. Nothing wrong here, if I insert incorrect pin I cannot unlock my sim card so it's detected correctly.
After that I will get another prompt to insert a pin, this time it's a little different and the problem with it is it doesn't work. If I input the same pin as I did before it will say "Request for unlocking network wasn't successful" so I can only cancel out of that which will leave my sim card locked.
When I tried to look into settingsI found that "Lock sim card" option was not checked and if I check it, it will ask my to enter my pin which again doesn't work.
I tried setenforce 0 in emulated terminal which did nothing.
Also I looked on internet for this problem with no solution I only remember reading about some script which maybe fixes this issue but I don't know where I saw it or if it actually works.
Flippy485 said:
I have recently managed to install resurrection remix 5.0.2 on my Xperia SP and it works very well except for one major thing, sim card.
When I start my phone I will get a prompt to insert my pin. Nothing wrong here, if I insert incorrect pin I cannot unlock my sim card so it's detected correctly.
After that I will get another prompt to insert a pin, this time it's a little different and the problem with it is it doesn't work. If I input the same pin as I did before it will say "Request for unlocking network wasn't successful" so I can only cancel out of that which will leave my sim card locked.
When I tried to look into settingsI found that "Lock sim card" option was not checked and if I check it, it will ask my to enter my pin which again doesn't work.
I tried setenforce 0 in emulated terminal which did nothing.
Also I looked on internet for this problem with no solution I only remember reading about some script which maybe fixes this issue but I don't know where I saw it or if it actually works.
Click to expand...
Click to collapse
The script was necessary years ago for a similar problem. Rr502 doesn't need it.
This problem sounds so strange, defectuve hardware could be to blame.
1. Please test your sim in another mobile phone.
If it doesn't work in there too, get a replacement sim from your operator.
2. Start from scratch. Go back to stock rom, test your sim. If it doesn't work then, you have to replace your mainboard. (Get one with unlockable bootloader!)
3. If all your hardware is fine, do ALL stock updates. 207 was the last one as far as I remember. Then, install rr502 again. It should work now.
Kaffeetrinker said:
The script was necessary years ago for a similar problem. Rr502 doesn't need it.
This problem sounds so strange, defectuve hardware could be to blame.
1. Please test your sim in another mobile phone.
If it doesn't work in there too, get a replacement sim from your operator.
2. Start from scratch. Go back to stock rom, test your sim. If it doesn't work then, you have to replace your mainboard. (Get one with unlockable bootloader!)
3. If all your hardware is fine, do ALL stock updates. 207 was the last one as far as I remember. Then, install rr502 again. It should work now.
Click to expand...
Click to collapse
Thanks for replying. I think I know what the problem is now. My theory is because I installed carrier locked firmware (there were only 2 for my country both carrier locked I guess), my phone locked my network and I had no idea that could happen. So of course I typed in bunch of random codes and wasted all my tries, also had no idea that could happen. That's why I thought It was ROMs fault but it seems that I flashed incorrect firmware and now it's too late. If I go to service menu a go to sim info everything is ok except sim network. And there are 0 tries left. Well now I have different firmware that should work fine with every sim card but phone is locked and the only thing that I learned is if I want to unlock that network it will cost a lot of money. I don't know if there is any other way to unlock it but yeah, it seems that now I'm stuck.
Flippy485 said:
Thanks for replying. I think I know what the problem is now. My theory is because I installed carrier locked firmware (there were only 2 for my country both carrier locked I guess), my phone locked my network and I had no idea that could happen. So of course I typed in bunch of random codes and wasted all my tries, also had no idea that could happen. That's why I thought It was ROMs fault but it seems that I flashed incorrect firmware and now it's too late. If I go to service menu a go to sim info everything is ok except sim network. And there are 0 tries left. Well now I have different firmware that should work fine with every sim card but phone is locked and the only thing that I learned is if I want to unlock that network it will cost a lot of money. I don't know if there is any other way to unlock it but yeah, it seems that now I'm stuck.
Click to expand...
Click to collapse
In this case, you definitely need a new mainboard.
There is no hack, no trick, no whatever. New mainboard!

No mobile network connection, no IMEI

Hello,
my Xiaomi Mi 9T Pro running on stock MIUI Global 12.5.1.0 (RFKEUXM) can now suddenly not connect to my mobile carrier.
I hope somebody can help me out.
Some facts and stuff I have tried:
The connectivity icon on the top is just grayed out now and shows an X.
But that was not the case in the morning today.
At that time it showed full bars, but not the usual 4G text and the mobile internet did not work. After some attempts written below it is now just gray.
Mobile internet and cell service do not work.
I have rebooted multiple times.
The IMEI for both SIM slots is shown as 0.
No baseband version is shown.
(I am sure that this was also not the case early in the morning.)
I have never installed a custom ROM on this device, bootloader was never unlocked.
The SIM card is correctly inserted and the phone number is shown in the settings for SIM slot 1.
Trying SIM slot 2 (incl. reboot) did not fix the problem.
The SIM status shows that the service is not available, also on the top left when the phone is locked. ("Dienst nicht verfügbar" in German locale.)
Trying the SIM in another phone works, which I think makes it not a carrier problem.
Trying another SIM in my phone also does not work.
I unfortunately had dropped the phone days before, but no damage visible at all (phone case FTW).
Also it worked without problems, which makes me hope this is not hardware related.
WLAN works, so internet connectivity is possible.
Phone is out of warranty.
I did search for other threads with similar issues, but they all seem to be related to having flashed custom ROMs and then losing the IMEI.
Does somebody have any idea how I can fix this?
Thank you!
Edit: I just remembered/saw that I did do the "Xiaomi Service Framework" system app update to version 6.0.6-G yesterday night, maybe that caused the problem? Currently researching on how to roll that back. If somebody knows, please do tell.
@Philipp said:
Hello,
my Xiaomi Mi 9T Pro running on stock MIUI Global 12.5.1.0 (RFKEUXM) can now suddenly not connect to my mobile carrier.
I hope somebody can help me out.
Some facts and stuff I have tried:
The connectivity icon on the top is just grayed out now and shows an X.
But that was not the case in the morning today.
At that time it showed full bars, but not the usual 4G text and the mobile internet did not work. After some attempts written below it is now just gray.
Mobile internet and cell service do not work.
I have rebooted multiple times.
The IMEI for both SIM slots is shown as 0.
No baseband version is shown.
(I am sure that this was also not the case early in the morning.)
I have never installed a custom ROM on this device, bootloader was never unlocked.
The SIM card is correctly inserted and the phone number is shown in the settings for SIM slot 1.
Trying SIM slot 2 (incl. reboot) did not fix the problem.
The SIM status shows that the service is not available, also on the top left when the phone is locked. ("Dienst nicht verfügbar" in German locale.)
Trying the SIM in another phone works, which I think makes it not a carrier problem.
Trying another SIM in my phone also does not work.
I unfortunately had dropped the phone days before, but no damage visible at all (phone case FTW).
Also it worked without problems, which makes me hope this is not hardware related.
WLAN works, so internet connectivity is possible.
Phone is out of warranty.
I did search for other threads with similar issues, but they all seem to be related to having flashed custom ROMs and then losing the IMEI.
Does somebody have any idea how I can fix this?
Thank you!
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Click to collapse
Did you check Settings, SIM cards and Mobile networks, SIM 1 (if SIM is in Slot 1)
Do you have Turn on? If Turned Off, then do Turn On
If not, ie if it does not recognize the SIM card, then it looks like a hardware issue
Assuming, as you say, that SIM card is ok, correctly inserted, and that phone runs only the stock firmware - hence no root, no custom ROM, no custom Recovery (that user could possibly wipe partitions), etc
Maybe, some connection got loose and later disconnected completely
Thanks for you answer.
I am sure the SIM is inserted correctly and working. It's been in there probably for years now.
Don't know if you saw my update above about "Xiaomi Service Framework". Checking that right now. Maybe I should just do a factory reset.
What I have noticed now a couple of times is that the phone crashes and reboots, just now happened when I connect for USB debugging or before when trying to enter the SIM pin after a reboot, ...
@Philipp said:
Thanks for you answer.
I am sure the SIM is inserted correctly and working. It's been in there probably for years now.
Don't know if you saw my update above about "Xiaomi Service Framework". Checking that right now. Maybe I should just do a factory reset.
What I have noticed now a couple of times is that the phone crashes and reboots, just now happened when I connect for USB debugging or before when trying to enter the SIM pin after a reboot, ...
Click to expand...
Click to collapse
But if the phone does not recognize the SIM card, it would not ask for the SIM pin
zgfg said:
But if the phone does not recognize the SIM card, it would not ask for the SIM pin
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Click to collapse
Agreed, therefore I am sure the SIM is recognized. The phone even shows my number and the SIM has the carrier name.
@Philipp said:
Agreed, therefore I am sure the SIM is recognized. The phone even shows my number and the SIM has the carrier name.
Click to expand...
Click to collapse
If the carrier name is recognized, then IMEI cannot be NULL
Very strange
Try to play with Preferred network type setting
Maybe something really got wrong with the updated Framework
zgfg said:
If the carrier name is recognized, then IMEI cannot be NULL
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Click to collapse
Oh, I though the IMEI is device specific and should be there even without a SIM inserted.
@Philipp said:
Oh, I though the IMEI is device specific and should be there even without a SIM inserted.
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Click to collapse
AFAIK too - but without IMEI it could not attach to the network and therefore cannot show carrier name
Hence strange, and/or the contradictory descriptions/observations
zgfg said:
AFAIK too - but without IMEI it could not attach to the network and therefore cannot show carrier name
Hence strange, and/or the contradictory descriptions/observations
Click to expand...
Click to collapse
Ohh, sry there is a misunderstanding.
The carrier name is only shown as the NAME of the SIM card (I guess it is stored on there or the phone has remembered it). But there is NO connection or carrier name shown in the top notification bar.
@Philipp said:
Ohh, sry there is a misunderstanding.
The carrier name is only shown as the NAME of the SIM card (I guess it is stored on there or the phone has remembered it). But there is NO connection or carrier name shown in the top notification bar.
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Click to collapse
Yeah but you still have unknown IMEI - that's something that should have not happened
Anyway, go to Preferred Network Type and try with Prefer 4G, Prefer 3G or Prefer 2G - maybe, with the updated Framework, something went wrong with the bands support or so
If it wouldn't help, then I'm out of the ideas how to solve
So I did do a hard reset now, and it worked for a short time (IMEI is back), then it doesn't again, and ... just now again. It really is not stable.
Thx. I will post updates when I know more.
Unfortunately the phone keeps crashing and rebooting when using it. It just freezes and restarts, and sometimes it takes a long time to restart (seems like a crash loop).
Twice I also saw some graphic artifacts (bright magenta and green) on a small part of the screen.
I don't think this is just a mobile network connection problem anymore.
BTW: I have installed an older version of Xiaomi Service Framework (also the hard reset reverted it to a much older version), but that did not help.
Hey!!
I hope you doing great
Did you manage to solve the issue?
@Fawad Hussain
Unfortunately I could not solve it, so I am not able to use the device anymore.
Btw, as far as I can see there is no current smartphone without a notch/punch hole which is not gigantic (ASUS Rog Phone 6).
Fawad Hussain said:
Hey!!
I hope you doing great
Did you manage to solve the issue?
Click to expand...
Click to collapse
Same thing happened to me, I have managed to get it thanks to this guy in the video which I don't understand what he is saying but I just followed his steps, so if you are looking for a solution this video is.
But my device is not rooted and bootloader is locked, I tried ways but don't know how to root it or unlock bootloader properly

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