Can I Use An AT&T Phone With My Tmobile Sim Card? ?

[Hope1944]

If so, what happens with that top 5 display and how will tmobile know who are my top five?

 

[jocoolguy]

Unlock code

If so, what happens with that top 5 display and how will tmobile know who are my top five?

You need to Unlock Mobile Phone from AT&T network lock to use with T-mobile sim card...You can get the unlock code from the site Superunlockcodes.com/supported-phones/rs12wp7/ and Unlock it easily.....Without unlocking the Phone you can't use with other GSM Network Sim card.