Used by the routines at 776F and 77A3. Holds either the address of the second byte of the entry in the phone message table at 6B4B or 6B72 that corresponds to the phone that Sam is calling (if the person on the other end has a message for him) or picking up a call from, or the address of the final byte of the phone table at 6B72 (if the person Sam's calling has no message to give); this address contains the number of the message corresponding to the name that Sam must give in order to receive the telephone message, or 0x00 if no name is required to receive the message, or 0xFF if the person Sam's calling will respond with message 0x2E (I DUNNO NO {name}).