Samsung Galaxy Note 4 unblacklist service for:

AT&T - (SM-N910A)
T-Mobile - (SM-N910T)
Verizon - (SM-N910V)
Sprint - (SM-N910P)
Canada - (SM-N910W8)

Service is done by a remote tech through USB cable. After purchase, you must speak with a technician on the live chat during normal business hours from a windows computer to complete service on your phone.