• installment payments have not been paid. [Blacklist because of debts]
• still under contract. [Blacklist because contract]
• reported as lost or stolen. [Blacklist because of lost / stolen]
• on another account
• eligible to be unlocked now because it’s recently been upgraded

To check your IMEI on the operator and find out on whom it is blocked, it is recommended to order - Apple iPhone check info by IMEI [GSX]

To check your IMEI in the presence of the black list, we recommend ordering a preliminary check - Check iPhone Blacklist AT&T USA

If during the activation iTunes asks to enter ZIP and SSN data you need this service.

If your IMEI is clean, it is possible to unlock it by the service on the link: USA AT&T iPhone Clean

1. This service is only for unlocking from the operator AT&T USA. If you order this service for unlocking from any other operator - you will lose money for the wrong order.

2. There are no any guarantees for this service. In the case of a re-locking - cancellation of the order is not possible. If your phone has been unlocked by this service, we recommend you observe the following rules:

   - does not do restore through iTunes;

   - prevent the complete loss of charge and phone overload;

   - do not remove the battery if it is removable;

   - does not to reinstall the SIM card.

3. It is forbidden to do an order for unlock if the string Next Tether Activation Policy Description in your GSX check by IMEI is as follows:

• US AT&T/Cricket Locked 
• US GSM/VZW N61/N56
• USA GSM Default Polici

You will lose money for the wrong order.