Sim not activating - Xiaomi Mi 9 Questions & Answers

Hi guys! Randomly my mi 9 stopped recognizing the sim card. When the sim card is inserted there is also no wifi, when you remove it the wifi can be turned on. Have tried everything, hard reset and then Android setup not working also!!! After rebooting several times, sim in , out, in and out, different sims, rewiping data, nothing seems to work. Back to stock MIUI 11 not working. Updating to the latest 12.0.4 also not. Any ideas? Living in the US with zero support, so any help would be great. Thank s in advance!

APN type correct?
Try the following
default,supl,dun

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[Q] SIM problem.

XT 1032. Latest Lollipop, does everything fine except . . .
Sees the SIM when entered and calls for a restart
but then shows No Sim.
Tried everything that I can think of without success.
Suggestions welcome.

Mi3 No SIM card issue

Hello, I was using lineage Os latest nightly when I encountered this issue. I wanted d2w. So I flashed Zurion X. Phone rebooted to TWRP. So I flashed recankut kernel. Phone worked. But I noticed that it started showing no sim card. I tried flashing Lineage Os back and nothing. So I flashed MIUI latest global beta via fast boot. No SIM card issue persists.. Now Im beginning to think that the issue is hardware issue.. I dissembled the phone.. But the sim card connectors seems to be OK for naked eye.. MY phones I will is not affected, neither the baseband.. So I'm out of options now. Can someone suggest me a workaround to bring my phone back to life.
Thanks.
Also it seems that I can make emergency calls.. Which means the radio I working
nuwanmw1988 said:
Hello, I was using lineage Os latest nightly when I encountered this issue. I wanted d2w. So I flashed Zurion X. Phone rebooted to TWRP. So I flashed recankut kernel. Phone worked. But I noticed that it started showing no sim card. I tried flashing Lineage Os back and nothing. So I flashed MIUI latest global beta via fast boot. No SIM card issue persists.. Now Im beginning to think that the issue is hardware issue.. I dissembled the phone.. But the sim card connectors seems to be OK for naked eye.. MY phones I will is not affected, neither the baseband.. So I'm out of options now. Can someone suggest me a workaround to bring my phone back to life.
Thanks.
Also it seems that I can make emergency calls.. Which means the radio I working
Click to expand...
Click to collapse
It was my sim card tray.. The lower right coner of the sim tray was broken and it interfered with the sim card identification mechanism. With a new simple card tray my phone is fixed.
If the SIM card tray is damaged (for example, a piece of plastic is chipped off or a metal plate is deformed), this can be the cause of the problem when the Xiaomi smartphone does not see the SIM card.
I had such a situation on my Mi 3. In the service center they could not find the cause of the problem, I found it myself.
I hope this information will help to somebody.

Reboot loop (Zenfone GO/ZB500KL/X00AD)

Hello everyone,
I bought my new Asus Zenfone Go phone yesterday(09/23/2017).
Before installing my SIM card in it, I used Wi-Fi and added my google account and everything went fine.
After that I installed my SIM card and opened the data cellular and after a while the phone crashed and started rebooting many times and after that the whole cellular data were done.
But when I open the Wi-Fi the phone works fine.
Please I need your help, thank you.

LineageOS 16.0 - no mobile data and GSM connection seems unstable

Hello, I just flashed LineageOS 16.0 on my phone, as a replacement for PixelExperience before that, because of some other problems, and everything works perfectly, except for the SIM card... at first I tried to login into my Google account, and it needed the authorization code from the SMS, but the SMS didn't want to arrive... it did after a few minutes, and then after another 5 minutes the one from the other attempt did too.. which seems like there was some lag with GSM.. but it worked at least. Then I tried to make the mobile data work. I set up the APN just like I always did after MIUI factory reset and what not, but it didn't work. I read somewhere that it might help to wipe the caches in TWRP, so I did, but that didn't help either. I restarted the phone many times since then, and it still doesn't work.... Right now, the signal icon is empty, so I guess even GSM doesn't work now. Doesn't any one know what I should try next? Thanks
martinlukas456 said:
Hello, I just flashed LineageOS 16.0 on my phone, as a replacement for PixelExperience before that, because of some other problems, and everything works perfectly, except for the SIM card... at first I tried to login into my Google account, and it needed the authorization code from the SMS, but the SMS didn't want to arrive... it did after a few minutes, and then after another 5 minutes the one from the other attempt did too.. which seems like there was some lag with GSM.. but it worked at least. Then I tried to make the mobile data work. I set up the APN just like I always did after MIUI factory reset and what not, but it didn't work. I read somewhere that it might help to wipe the caches in TWRP, so I did, but that didn't help either. I restarted the phone many times since then, and it still doesn't work.... Right now, the signal icon is empty, so I guess even GSM doesn't work now. Doesn't any one know what I should try next? Thanks
Click to expand...
Click to collapse
Try to update firmware if that's help you
Harshad patel R said:
Try to update firmware if that's help you
Click to expand...
Click to collapse
I actually just tried to wipe everything, install LineageOS again plus Gapps, and then wipe the cache again after (dunno if that helped), and as soon as it booted in, everything worked So problem solved. Thank you anyway.
same problem for me, no lte no hspda sometimes never find any network, but it just not a problem because it is my old phone

Help 4G Network causing reboot

Hi, may I ask for your help and opinion? My new Realme X2 Pro is rebooting on its own. Not until after C.31 update I found out that Connecting to 4G is causing it. Yesterday after installing the update I inserted the sim the phone recognized the network and I checked if the sim is LTE ready and after a minute the phone freezes then reboots so I removed the simcard again then the phone work fine for the whole night then I inserted the simcard again in the morning then the phone reboots so I tried switching to 3G and the phone hasn't malfunctioned yet. What do you think? Is it a software or a hardware problem? Thank you
Update: I tried to download again and reinstall software update C.31 it didnt fix the issue.

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