[MDK22]

For those of us who have gotten the unlock code from AT&T for our various Lumia devices ...

Thursday, I fell back to WinPhone 8.0 from WinPhone 8.1 Dev Preview so I could download the official WinPhone 8.1 / Cyan update. Process took a while.

When you're done, don't forget to unlock your phone (my Lumia 1520 was sim LOCKED, again - you're flashing the AT&T rom to go back to 8.0).
- dial ##7820# (this works on my Lumia 1520)
- you'll get the screen w a lock & text box for entering unlock code
- if lock is OPEN, you're OK
- if lock is LOCKED, re-enter your unlock code

[nitrocs]

Good catch
Mine was re-locked & I had to put my unlock code in again

[berny_533]

Hi
Is data sense and wifi sense still available with the ATT 8.1 upgrade?

[Blacklac]

Hi
Is data sense and wifi sense still available with the ATT 8.1 upgrade?

Yes it is. On the 1520 at least.

[berny_533]

thanks will upgrade