My *understanding* of the Wave phones is only based upon what I have read. Apparently, each stateroom will have two portable phones (and I believe one charger). Suites will have four phones and two chargers (?).
Think of them as a cordless phone, that works on the ship, as well as on Castaway Caye (though earlier reports indicated reception on CC was spotty). Phones are only able to call other
DCL phones on your specific journey (you cannot call the Dream from the Wonder ... and you cannot call a landline).
The idea is that if your party breaks up, you can still keep in touch with each other through these phones. If your stateroom number is 5000 (example only), portable/cordless #1 will be #50001, while portable/cordless will be #50002 (you can still call the room direct at #5000). So, if you let the kids loose on the ship, you can still reach them to remind them to meet you for lunch or dinner. Also, if spouses get separated (on purpose, or by accident), one can call the other (when one spouse wants permission to buy artwork or jewelry ... or, when one spouse wants to know why the other is late for dinner).
If you are friends with someone in stateroom #7000, you can try to reach them in their stateroom (#7000). If there are not *home* ... Mom and Dad might have #7001 at the adult pool, while the kids might have #7002 in Buena Vista theatre.
It's the same concept on CC. You can call your stateroom from a portable/cordless (are you done napping yet?) ... you can call cordless to cordless (please bring me some food from Cookies BBQ, or parents at Serenity Bay can call the kids while at Pelican Point).
Apparently, there is an information card at, or near the phones, which explains how to use the phones. keep in mind, if you are using your CORDED phone in the stateroom, you must first dial *7* (I think), prior to dialing a specific room number or portable number.
Years ago, we used to bring those little portable walkie talkies with various channels. It wasn't long before DCL started to provide these onboard as a rental. Apparently, these phones are now available (initially released on the Dream), and are free of charge. I am not sure if DCL still offers the walkie talkie rentals. However, if the system works as I have described, I see no reason why most parties will need / want to bring walkie talkies.
***I do not know if the phones are water resistant or water proof.
***If anyone has first hand experience, please feel free to make corrections or amendments.
Steven (of Steven & Donna)