iPhones: Blacklisted iPhones can be Un-Blacklisted to be used with Simple Mobile or any other carrier that uses Tmobile's towers. (Unless its been UNLOCKED prior to it becoming BLACKLISTED)

If you wish to use the device with any other carrier, you would have to first Remove the Blacklist on the device. Then proceed with the UNLOCKING service ONLY after the device has been UN-BLACKLISTED.
                
(Cannot be activated on T-Mobile again. This does not UNLOCK the phone to use overseas or with any other carrier other than T-Mobile's towers.)