We have gotten into the habit of renting a cell phone (in Aruba) to make a few calls back to the business or check in at home.
Found out that St. Martin has a GSM network and thus our own phones won't work there even if they have international capability activated. So, we must obtain a global phone through Verizon and then pay approx $2.29/minute.
I've seen postings and ads telling you to go to a certain cell phone service on the island to activate your phone for international use too.
What do most people do? Don't misunderstand, we're talking about only a few calls in a week!