If all goes well, we will be heading to St. Maarten in 10 days (fingers crossed that testing, results and SXM approvals go well). My cellphone carrier won't work in St. Maarten. I'm taking an old galaxy s7 down and want to get a local sim card to use while there. Where in the Simpson Bay/Maho area is the best/most economical place to buy a sim card and set up phone service? Thanks for any help.