Device doesn't connect to mobile network - Xiaomi Mi 6 Questions & Answers

I was on PixelExperience (latest) and yesterday flashed through Magisk 17.0 and 17.1. Today morning device couldn't connect to mobile network at all (2G/3G/4G/LTE). Wiped it completely, flashed latest dev firmware and Nitrogen OS + unofficial Gapps for Android Pie. Everything works quite smooth, but still my device can't connect to mobile carrier - any ideas what I can try? It's crucial for me to fix it today since I need to be able to send/receive SMS tomorrow.

Tried switching sim slots?
Just to see if the sim card works with the other slot.
Does an IMEI number show for both slots under settings - about? (Don't tell us your IMEI)
Are you sure your network provider hasn't cut you off by mistake or some other weird account based issue?
Try another sim if you can get one.
A pay as you go sim without credit should still show a connection even if you can't use it

Yeah, I did try.
1. Tried other card (got polish Orange card which connects to EE, UK EE card - both work in my brother's SGS6).
2. IMEI is okay, don't know if IMEI SV should be 00 though.
3. Cards work okay in SGS6.
99% it's software issue - I've used Magisk modules to widen Wi-fi bands and other modules - I did format all partitions and flashed latest stable Global MIUI through fastboot though and it should override all the settings. I've used the *#*# code and I can't pass the test.

Related

Zenfone2 ZE551ML - Sim card issue with CM13

Hello,
Currently i am running the latest version of CM13 (cm-13.0-20160307-UNOFFICIAL-Z00A.zip ) on my phone, but this issue also occured with the other versions starting from the 1st of march.
With 2 sims inserted in my phone, both of these sim cards work fine when i put them separately in the phone, however when i put them both in some weird issues occur.
The problems start when booting my phone, the phone asks me to enter the PIN for sim 1, which works and connects the card to the network ( and fetches my latest messages and such )
Then the phone obviously asks me for the PIN of my second sim, which it accepts. However after accepting my SIM the same popup comes up asking me for my PIN for sim2 again.
And when entering the PIN it gives me the error : "SIM PIN operation failed".
After multiple attempts, it finally gets me in the phone. However the data on SIM1 is not functioning anymore.
What i've tried is:
Multiple different CM releases from the past week
Putting my phone in airplane mode and out again
Factory reset the phone
Does anyone know how to fix this issue?

No network - SIM PIN Operation failed

Dear all,
I'm having some serious issues about connecting to my service provider via my Nexus 5x (model LGH791). I'm based in Germany, trying to use o2. Due to the fact I'm using a german user interface some of the following translated description may vary from the original english descriptions.
Bootloader Info:
PRODUCT_NAME - bullhead
VARIANT - bullhead LGH791 16GB
HW Version - rev_1.0
BOOTLOADER VERSION - BHZ10r
BASEBAND VERSION - M8994F-2.6.32.1.13
CARRIER INFO - N/A
SERIAL NUMBER - 00b5xxxsecretxxxx
SIGNING - production
SECURE BOOT - enabled
DEVICE STATE - unlocked
Recovery: TWRP 3.0.2-1
Kernel: Stock Kernel.
Root: No, not rooted.
EDIT:
IMEI: looks like a valid IMEI
When I try to unlock my SIM via PIN I read the message: "SIM PIN Operation failed".
When I'm searching manually for a provider under Settings > Mobile Network I get the message "Error while searching for network".
I already flashed the sugested image from this XDA post here to change the base band.
I flashed the PureNexus ROM located on the XDA-Developers Forum, to change the base band too.
I removed the partition modemst1, suggested by this post, too.
I re-flashed the latest Stock ROM MTC20F from Google Developers.
I were able to choose the "European" and "Automatic" option under *#*#4636#*#* but I had to choose an option multiple times to successfully set it. Even choosing the USA Band says "Setting [USA Band] Unsuccessful". After alternating between "EURO Band" and "Automatic" a few times (varying) it says "Setting [EURO Band] Successful". Seems like some settings can't be set right away. Confusing.
When I'm prompted to unlock my SIM via PIN, I'm able to unlock it the first time. A few seconds pass and I'm prompted a second time resulting in a waiting/looping screen that says "Unlocking SIM..." that seems to be canceled after a timeout. The SIM card won't get unlocked after the second prompt.
Right now I'm not able to get any connection to a mobile service. The rest of the device works as expected.
I tested my SIM card in my Nexus 5. It's working fine. It's a self-cutted SIM card, formerly in the format of a microSIM.
I tested another SIM Card, used within an older HTC One Mini, that is working fine, too. It's a nanoSIM.
Anyone got any idea what's going on?
Best,
huppys

No service with any ROM..

Hello!
Today I took my Letv US x800 after not using it for a couple of weeks. I tried to connect my sim, but it doesn't work. It recognize a SIM Card, but that's all. When I reboot the phone it asks for the pin code. After that the APN settings of my provider are filled in correctly, but the phone can't find any signal. I tried it with several ROM's(Cuocu 11S, 12S, 14S and Betahydri 12.1), but it just can't find any signal.. Also I tried the SIM card in the different SIM slots, but also no result.
Can somebody help me with this problem?
Thanks in advance
1. wipe system, dalvik and cache.
2a. if you want to stay on 5.1 ROMS, flash 13S then your desired ROM
2b. if you want to stay on 6.0 ROMS, flash 16S then your desired ROM
3. If you still get no signal digit *#*#4636#*#* and in network select WCDMA preferred for example.

SPH-L520 Working on Ting? No 4G/LTE

UPDATE: 4G/LTE wouldn't work without erasing all possible APNs except Ting's (with some messing around to get settings correct). LOS14.1 continued to throw errors with this install though so ultimately re-flashed with RR and it's working perfectly now.
--
I'm trying to port an S4 Mini SPH-L520 (CDMA) for use with Ting. Has anyone successfully done this with full access to phone, text and data? Having updated the carrier settings while stock, then flashed LOS 14.1 I've got functional voice, SMS, WiFi and can see 3G sporadically when I refresh network settings, but 4G/LTE's a no-go -- I get a "Your mobile data service couldn't be activated" error from the setup wizard every time the phone starts. It's definitely seeing Ting's SIM card because it's showing the correct ICCID, but won't work at all in RUIM/SIM mode ("No service", "Select SIM Card" with no options) and defaults back to NV. Haaaalp? I'm very computer literate but cell phones are terrifying and mysterious black magic...

after flashing mi a2 lite mobile data not working in one sim

hello,
some days ago i flash my mobile with fastboot then i realise that sim card slot changed.
sim slot no. 1 is now 2 and sim slot 2 is now 1
after automatic update on android 10 latest version but sim 1 data connection not working..when i turn it on no cellular symbol show.
i tried correct APN setting, reset network setting, factory reset but still not working data connection in only sim 1.
sim 2 work well.
after that i decide to downgrade for android 9 and continue vai fastboot..then finally its work ..sim 1 and 2 both date connection work but sim slot problem not fix..
my question is how to solv sim slot exchange problem and android 10 one sim data not working problem.
thanks.
kaemon25 said:
sim slot no. 1 is now 2 and sim slot 2 is now 1
but sim 1 data connection not working..when i turn it on no cellular symbol show.
Click to expand...
Click to collapse
Swapped sim slots sounds like what happens when downgrading to Oreo. The fix for that is to use a newer (pie) modem partition.
https://forum.xda-developers.com/mi-a2-lite/help/sim-card-issue-downgrading-pie-9-0-t3874350
I see a more recent thread complaining that sim 2 does not work. I only use sim 1 and it works for me.
Did you try turning the phone off (not just sleep or reboot)? My data connection almost always dies when I install an OTA (probably TWRP). Turning the phone off and sometimes leaving it in airplane mode for an hour fixes it.
In my case, the network is rejecting data connections (call and sms works). This was not in the regular logcat...
adb logcat -b radio

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