I bought an unlocked AT&T Lumia 1520 from Swappa about 2 weeks ago. I plan on using this phone for Tmobile. I used a friend's nano sim card to checked to see if it was unlocked, and it worked. Now that I have updated the phone to 8.1, would my phone be locked again?
I used the phone app to type in ##7820# to check, and it is giving me a picture of a lock and a sim card, asking me to type in the unlocked code.
UPDATE:
I switched from AT&T to T-mobile yesterday and received the unlock code for the phone from AT&T the day before. I tossed in the SIM card and found out that it is still unlocked. I also phoned ##7820# and still saw the lock and SIM icon. So the icon is a bad method to check if a phone is unlocked. Thanks everyone for their input about the situation. :smile:
I used the phone app to type in ##7820# to check, and it is giving me a picture of a lock and a sim card, asking me to type in the unlocked code.
UPDATE:
I switched from AT&T to T-mobile yesterday and received the unlock code for the phone from AT&T the day before. I tossed in the SIM card and found out that it is still unlocked. I also phoned ##7820# and still saw the lock and SIM icon. So the icon is a bad method to check if a phone is unlocked. Thanks everyone for their input about the situation. :smile:
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