Traveling Soon - Need Advice (Belize, International Phone Use)

I'm going to be traveling soon to Belize, wondering what the best way is to be able to use my phone down there. I had a G3 last year when we went to Mexico, and the Mexico plan addon worked fine for us there for the bit we needed to use it, but I'm not sure what to do this time. I went to the Verizon Trip Planner site but they don't show the 6p of course.

So go buy another sim while I'm down there?

Or should I just turn on airplane mode and use wifi only when I can and rent a local phone?

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