Currently AT&T has already begun to offer the unlocking service for the off-contact iphone users, users can go to at & t retail stores to ask for unlocking service. The unlocked iPhone can work with the T-Mobile network (although the data transmission speed is relatively slow) or the other overseas network, but it can not support the CDMA-based network. As for the att iphones users still signed contract with AT&T, if you want to unlock their devices, your need to firstly pay for all the remaining calls fee.
Methods of How to unlock AT & T iPhone, including manually getting unlocked att iphone.
method 1: Go to AT & T retail stores to provide the IMEI code to apply to be unlocked.
Method 2: Call AT & T Service center, provide the IMEI code of your phone to apply to be unlocked.
method 3: log on the AT & T website to provide the IMEI code to the Network Service to apply to be unlocked, this method is stuitable for the most of locked iPhone 4 users.
When you submit the IMEI code and tap ok, you will abtain the unlocking qualifications then you will be required to provide to the mailbox, waiting for about a week, you will receive the unlock code and unlock methods, just follow the prompts to unlock your phone.
The unlock code is administered via iTunes. Users are instructed to connect their device to iTunes on a Mac or PC with Internet connectivity and then back and restore the iPhone with iTunes. After the restore, the phone will display a message that reads, “Unlock Complete. Congratulations, your iPhone has been unlocked. To set up and sync this iPhone, click Continue.”
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