[cfscorpio]

So I updated my Lumia 920 to the Windows 10 TP and things were working well enough. Some apps wouldn't run like maps but messaging was ok. It was running slow overall so I powered down my phone and turned it back on. After that it says I have no sim, I can't send texts or make phone calls. Actually the messaging and phone app both crash on startup.

This is a huge problem and MS needs to fix it A.S.A.P.

I also noticed it says my carrier is AT&T in the Device Information but I unlocked my phone and have service with T-Mobile.

[WFdude]

I am having the same issue with a Lumia 925 on Lycamobile (T-Mobile reseller). I have tried several reboots, a soft reset, and removing the SIM, restarting and re-seating. Note that I did get the 05 SIM error after booting with it removed. I also tried manually selecting a provider in Settings>Network and Wireless>Cellular and SIM>SIM settings and the text reflects a touch but nothing happens.

Beta type issues I can live with but no cellular connection on a cell phone is a bit over the line :-)

[ChinuKabi]

I have the same problem on my 520. The airplane mode has activated automatically and the settings for airplane mode has disappeared. Reverting back.

[Sunil Kumar33]

same issue with my phone. I have removed the sim card and using it in my spare phone. don't know when will they fix it

[Jeffrey Poen]

Same issue with my Lumia 925, after upgrading TP10 the SIM is one time found, had to unlock with the SIM-code when the Phone booted. After a reboot the SIM is not found, starting the Phone App it automatic close.

[Vasrias]

Same here, everything worked, I restarted the phone and "no sim" since then. This is a SERIOUS bug. I know it's a TP, but this is a real mess!

[bawajose]

Me too have the same issue on my L720. Just started the recovery :-(

[avi_920]

LUMIA 920 users:

DON'T UPDATE TO WINDOWS 10 TECHNICAL PREVIEW!

It sucks to the core! Nothing works!

- SIM never detected; no phone, no SMS

- Backup is never done completely

- Almost all the apps are not working, closes by itself after opening

[Zulfigar]

Hard resetting works, had the same issue and that's what had to new done to fix It

[avi_920]

Can someone update if WhatsApp is working in L920 with w10 tech preview??

[avi_920]

Hard resetting works, had the same issue and that's what had to new done to fix It

How to do the hard reset? Should I just hit the reset button from the setting menu?

Is it possible to revert back to WP8.1? If possible, will i be losing app data?

[Amar Mesic]

Same here, says "No sim" on my Lumia 1320. Rolling back to 8.1

[jishnu nambiar]

How to do a hard reset ??

[avi_920]

Same here, says "No sim" on my Lumia 1320. Rolling back to 8.1

How to roll back to 8.1? Will there be any app data loss?

[badger8080]

I can't get out of the WP app

[Pepe Kuisma]

Same problem here with 1020. First time it booted it asked sim, but didn't regonaice what I dialed so had to shutdown the phone. And after that it has not asked pin. And only if I have no sim in phone, the phonebook/recentcalls etc. opens and says no sim detected. Back to the stoneage----->

[reznorek]

Same here. How long taking hard reset?

[Amar Mesic]

How to roll back to 8.1? Will there be any app data loss?

You can roll back using Windows Phone Recovery Tool. I use the backup option to backup text messages, photos and app list + settings. Not sure about specific in-app data.

[lmoritz]

I have a 520 (Rogers) with the same problem.

[d00cwe]

Same issue here on 1020

[Youssef Ibrahim]

Same here L920 a7a :D

[Guzzy]

I had an issues with my L920(AT&T) where my device was being slow, not launching apps, and not detecting my SIM card. I hard reset the phone after soft resets not working last night. My phone has been working fine (for a tp) all morning.

[tosvus]

Same her 1020 ATT

[3earnhardt3]

Same on 928, thanks Microsoft for reminding me why I need to be more patient! I can say that before I had catastrophic failure of the OS, there were glimpses of hope in windows 10.

[a5cent]

We have multiple threads on this topic. Please continue the discussion here:

http://forums.windowscentral.com/win...etect-sim.html

Closed.