Can you use unlocked phones with at&t?

[heather]

Specifically an htc hd7. It is a t-mobile phone, I believe. I was wondering if I could use that phone, or any other unlocked phone that may not originally be an at&t phone, through at&t?

[vicecaptain]

If you are unlocking a GSM network locked phone, it can be then used with any international GSM SIM card including AT&T unless the unlocking process is not a safe one. Certain unsafe unlocking methods or flashing would give problems while working with other SIM cards. The safest way to unlock a mobile phone is using unlock code. You can get the unlock code for a mobile phone either from its respective network provider or from any trusted vendor online like WickedUnlock.Com This site provides accurate unlock codes at affordable cost. Good luck.