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T-Mobile has very good international roaming for postpaid customers.
DomRep is one of the "Simple Choice" countries where texting and (slow) data are free and calls are only 20¢/min.
They use mostly the same frequencies as the US, so any T-Mobile phone should work fine.
Read the fine print for the details.
What plan are you on?
Hullo magenta4661341! Just wanted to check in and see if you were able to find the answer to your question using the links Dr N provided. If you still need some assistance, please let us know what type of plan you have and we're happy to help!