From Celebrity website: Friends or family can reach you 24 hours a day via Celebrity's Satellite Service. Before you depart for your cruise, leave the following number with anyone wanting to reach you: 001-877-266-1020.
Can't you just call their mobile instead???
Phoning passengers via Satellite on a cruise ship can be an expensive business. It cost my girlfriend about £60.00 when she phoned me in my cabin a couple of years ago! I don't know what was the biggest shock, getting the call or finding out how much it cost! Please, before you phone the ship, phone Celebrity and ask them exactly how much a minute the call will cost.I think the cost has come down quite a bit in recent years and I believe P&O charge around £3.00 a minute now. Although it is too late for this time, in future try sending a card to the companies port agent in the destination prior to their special day. The card will be delivered to their cabin once the ship gets to that port, and you could also include a complementy bottle of wine pre-ordered by you in with that? Good Luck.