Hi guys, I just bought a used AT&T Samsung NOTE 1. The seller claimed it was unlocked which most probably it is not because it does not recognize any SIM other than an AT&T SIM. This is not the issue, though. When I stick a T-Mobile sim in it it and turn it back on, it does not display "Enter Network Lock Control Key". Is this a normal behavior or am I missing something? Come to think of it, when I inserted two international sims the phone displayed the following message "sim not provisioned mm#2" Thanks.