We decided this cruise to do as I have read others and add phone cards to the tips..the only question I have is which type to buy..honestly, I've never bought one before...someone mentioned the ones at Sams, and we are members there...are they AT&T cards? Must they state "international" minutes, as I assume many CM's will need these...if anyone can recommend a specific kind for me, I'd really appreciate it...Thanks. Jodi