Hi, You can unlock an iPhone 4 locked to AT&T network safer and easier through remote unlocking method. You can get the remote unlocking for an iPhone 4 from
www.prounlocking.com/apple-iphone-4/rs8wp9/ at affordable cost. This method of unlocking doesn't require a jailbreaking too.
Here are the steps for unlocking an iPhone 4,
1. Wait for us to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 4 phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 4 to iTunes with a
NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 4.
6. Disconnect your Apple iPhone 4 and reconnect it after 10 seconds.
7. Your Apple iPhone 4 is now unlocked.