Unlock iPhone from AT&T can be done by only IMEI number.
Simlock never return even after upgrade. After unlock You can use iphone in other network t-mobile, vodafone, orange and others.
Supported are all models and version.

This is a fast and easy unlock way.

Unlock now any iPhone 3G, 3GS, 4, 4S from AT&T to use it with all sim card.

How to unlock iPhone ?
1. go to sim-unlock.net
2. choose Your iPhone model
3. choose network

after all procedure You need to wait from 1h to 2 days for unlock confirm

After receiving information about the fact that the IMEI has been saved to the database Apple, do as following:
1. Connect your iPhone to your computer
2. Launch iTunes
3. information about available updates for your iPhone will shown, upload them
4. iPhone is unlocked now

Sometimes necessary to change the software to the highest available version.

watch this video guide with help



Unlocking iPhone is easy, fast and cheap.
Your phone will never locked again.
Unlocking also allow You to increase value of your iPhone because it can be used with all network cards.
Permanent unlock is done by itunes and apple database, your iPhone will be permanently Unlocked to work on any GSM Carrier, and you can use any sim card operators such as Movistar, Rogers, O2, Orange, T-mobile, Vodafone, Telenor, Telia, Hutchison, Telenor etc.

› See More: Easy Unlock ATT iPhone How to Unlock At&t iPhone 3G 3GS 4 4S for permanent Unlocking