Text messages on a cruise ???

Question

My boyfriends on a 8 day cruise to san juan puerto rico and i wanted to know if i can't talk to him on the phone can i text him?

& will he get it. I herd that most people turn off there phones cause it charges you for roaming he has t-mobile.

Also when he gets there will it be a lot of money to call me or text me?

He's on Carnival cruise