We purchased a Chippie sim from Sharon, but it doesn't provide data, only calling minutes. You can purchase data plans for the sim, but they're not cheap. For data we just use the free wifi when we're out and about. I did buy one day's worth of data while we were there, and that worked well (can't remember now why I did that; the wifi at our resort may have been down). Email Sharon; even if she's off the island, she has people who will respond to your questions.

And welcome to the forum!