USA AT&T CONVERT UNPAID BILLS AND IN CONTRACT IMEIS -> CLEAN OR ACTIVE LINE TO BE DONE ON FREE SERVICE OR ON ACTIVE LINE ONE
( LOST / STOLEN NOT SUPPORTED ) AND WILL NOT BE REFUNDED AND THEY CANT WORK IN USA
After DONE , imei may become clean or active line .
then you can use clean cheap service or active line service to unlock your device
depending on what the imei has become ...