Depends on the country.

Countries in LATAM have very weak enforcement, so if you keep your mouth shut, you won’t have to pay taxes.

Usually just following Don’t Ask, Don’t tell avoids any issues on countries where enforcement is weak. Just talk with the locals about taxes and you can get a general sense.

I highly recommend working with a local lawyer the verify what the rules are, and what risks you are taking.

I’d say KFC in Pyongyang is probably the furthest I’ve been. 1500 KPW for a meal is a steal.

+1 for US mobile. Been doing this for almost a year, and, so far, works like a charm.