We have Motorolas too, and here are some examples. Outside to outside works all the time. For instance, verandah on deck 5 (or was it 6?) to somebody by the pool, or deck 9 or 10, or aft on deck 7. From within the room, it just depends on how far away they are (and how much metal is between you). A room on deck 2 to somebody poolside --- very scratchy connection, not usable. Inside stateroom on 5 to somebody poolside --- sometimes yes, sometimes no, depending on where the topside party is. Room to theater, or lab, or any restaraunts -- this worked consistently. From Castaway to the boat -- no problem. So, they mostly worked, and in a pinch there's always house phones if you're calling your room.