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The last time I checked (it's been several years), T-Mobile was the only company whose phones would work natively in Belize, as long as it was only a temporary situation. Service from other American companies might actually work, but at a steep cost. Another option would be to get a tourist SIM, which would temporarily replace the existing SIM in your existing phone. Those are available online; I also know that at least one of the Mobile companies (Smart) in Belize offers them.

You can get a Belize SIM at any phone shop of telephone company office. An ID is required to purchase and register one.

@grannybunni

Technically, yes. Just make sure your plan has international voice and data. Typically, T-mobile gives customers international data for free, but voice has roaming charges.

Depending on your phone, you may be better off purchasing an e-sim and using WhatsApp to make calls and text. A huge portion of the population(including businesses) use WhatsApp to communicate.

If you don't plan to move around a lot, just connect to Wi-Fi when secure and available.

You can purchase an e-sim(embedded sim. It's a virtual sim card) plan online prior to arriving and you'll be able to switch to that plan seamlessly before you leave. Otherwise,  as others have mentioned, purchase a local sim card(just don't lose your original sim card). Send me a direct message and I can provide a discount code for the service I use, Saily. It isn't much, but its $3 off your 1st purchase. the downside is it requires an app.

There are other similar services that don't require an app. Search online for Belize esim.