This unlock service network T-Mobile USA for IPhone 4,4S,5,5C,5S,6,6+,6S,6S+,7,7+,8,8+,X
Blacklisted imeis can't be work in USA after unlock also.
If you 100% know what is T-Mobile USA, check on blacklist with this service - T-MOBILE USA BLACKLIST CHECK
If you don't know what network your phone is locked, do check with the help of this service - IPHONE CARRIER + SIM-LOCK STATUS
If you want to unlock a more 1 imei - enter all the imei in a column and specify the number in the corresponding field.