nokia lumia 900

[WPCentral Question]

i have at&t nokia lumia 900, i try to unlock it, but at the end it display "sim card is missing or invalid.", then "no service-emergency call only." the sim card is new with a current phone number.

 

[mrpapid22]

i have at&t nokia lumia 900, i try to unlock it, but at the end it display "sim card is missing or invalid.", then "no service-emergency call only." the sim card is new with a current phone number.