T-mobile and Verizon have data only free trials using eSim.
T-Mobiles free trial is unlimited data for 3 months.
Verizon’s free trial is 30 days and 100 GB.
Theres a few MVNO’s that have free trials like Cricket, US Mobile, Visible, Google Fi, Mint Mobile, etc.
For Belize you can find eSim providers using https://esimdb.com. I’m not sure what local plans they have and how difficult it would be to get.
Dhaka, Bangladesh. I spent a few months in multiple cities in India and Bangladesh and everywhere I went was extremely dirty. Kolkata is dirty but honestly it is somewhat livable and it is getting cleaner in the last few years. But Dhaka stood out in a big way and it’s probably the worst place I have ever been to and I am never going back.