Originally Posted by dwd3885
I have my SIM unlock code from AT&T. However, I put in an old T-Mobile SIM and it isn't recognized. Now the SIM was last active in December 2012. Does the SIM need to be active for it to be recognized and allow me to enter the unlock code?
Yes, when you enter a bad or unused SIM card into a phone - the phone will recognize it has one in it but will not work, obviously. If you had an active SIM to fit and put that in, it should prompt you for the unlock code before the phone can be utilized.
Device: Nexus 5 [D820] on AT&T's LTE
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