Update confusion,

[adeelkhowaja]

HI guys, my lumia 900 is AT&T phone, and the location I am right now doesn't support this, my phone is unlocked, I was wondering that if ill update my phone will it still support other sim(s) like right now or it will get lock, please help:sweaty:

 

[WorzelGummage]

Updating the firmware will not re-introduce the SIM lock so you will still be able to use any SIM