How To Unlock AT&T IPHONE?
1. Send the IMEI to our server
2. Wait till we return the answer “activated”
3. Then, install last version of iTunes
4. Make sure phone is last version updated by official itunes sw
5. Connect phone to iTunes with not accepted (not valid) simcard
6. Wait until itunes detect phone
7. Now disconnect phone and reconnect after 10 seconds.
8. Phone Unlocked.
Why should I unlock my iphone
1-You can use your iphone with any GSM network