I keep my main US phone on airplane mode the entire time, only connecting to WiFi. I then carry a second iPhone 14 with me in which I swap out the SIM card to a local provider's plan and then have local calling, text, and data. It's MUCH cheaper than trying to work with your US carrier's international plan (which will be super $$) and then I get a local phone number for when I'm out and about. I've used this system for years and it works well.