This is an unlock code for many AT&T cell phones. Please feel free to contact us if you are worried that your phone will not be supported. Our mobile cell phone unlock codes work by inputting a certain number (the unlock code that we give you for FREE with TrialPay) into your phone to unlock it to any provider. Let's say that you purchased a Blackberry from T-Mobile and now you wish to change to another provider. When you try to put your new sim-card into your previous provider's locked phone, it will give you a message saying that your SIM is not supported. Using our unlock codes, your phone will now support any SIM card! Our codes work for life, giving you the flexibility to change providers how ever many time you wish! All you have to do is supply us with your phone's IMEI number after checkout (usually found by typing in *#06# then pressing Dial on your phone ... just like making a regular phone call and also your service provider which your phone is currently locked to. We will email you after you payment has been received (usually automatic) asking for your phone's IMEI number with detailed instructions on how to do so. All you have to do is reply to the email with the information requested, and within 24-36 hours, we will send you instructions on how to unlock your phone ... FREE OF CHARGE!! Please contact us at firstname.lastname@example.org with any questions before ordering. Please note: One order works on your specific phone model. Unfortunately, there is no way to unlock more than one phone with a code provided. If you wish to unlock multiple phones, please make multiple orders.