We just switched a couple of months ago from Verizon and T-Mobile has been fantastic in Aruba. We have unlimited International data/roamimg for zip....local calls (no plan needed) are 25 cents/min and it auto switches to wifi calling in the condo so no charge for calls to USA cell phones on AUA (or SXM).

I have made three short local calls, received and sent MANY texts/pics and emails on the beach off wifi with zero cost.

If you have T-Moblie just take it off airplane mode and it will say "Welcome to SInt Maarten" and you are good to go

I know it's lame to change for this trip but keep it in mind for the future