System

Following are the 5 selections for system choice:
^ In the Home Only system, the phone only operates when used in the cellular service it was originally registered.
^ In the A Only system, the phone only operates when it uses the A side of the system.
^ In the B Only system, the phone only operates when it uses the B side of the system.
^ In the A then B system, the phone attempts to use the A side. If not available, it will switch to the B side.
^ In the B then A system, the phone will attempt to use the B side. If not available, it will switch to the A side.