Hey there! If you have a postpaid Simple Choice plan, roaming in the Philippines should be pretty awesome! You can take a look here -- International Plans | Traveling Abroad without Roaming Fees | T-Mobile for details. I'd definitely recommend scrolling down and entering your device type to check compatibility, and then if you know where you'll be staying you can also input your province or city in the box above and to the right of the map to see more detailed coverage.
Lastly, we have an International roaming checklist that can be super helpful to review (and save) before you go, because it includes our roaming care number in case you need to reach out while you're abroad.
Please let us know if you have any additional questions -- hope you have an awesome trip!
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Keep in mind that Simple Choice's data in the PI is free, it's also slow. This should not be a problem for texts and most e-mails, etc but you won't be able to stream videos. Large photos will take a long time to send and receive. If you plan to use your phone for navigation, you may want to preload the maps of your area. as Marissa mentioned, you also want to check your phone. The Philippines use 900, 1800 & 2100 MHz bands (LTE bands 1,3 & 8). If your phone does not have at least 3G on the 2100 band (#1), you'll probably have 2G data which will be as useful as 2G data in the USA.