System

There are 5 selections for system choice:
^ Home Only - The phone will only operate when it is used in the cellular service it was originally registered.
^ A Only - The phone will only operate when it is able to use the A side of the system.
^ B Only - The phone will only operate when it is able to use the B side of the system.
^ A then B - The phone will attempt to use the A side. If not available, it will switch to the B side.
^ B then A - The phone will attempt to use the B side . If not available, it will switch to the A side.