I'm planning to travel from US to Europe (mostly Spain and France), and also Central America (mostly Roatan and big cities in Honduras) in the months ahead. I'd like to use a cell phone service that is truly seamless from the perspective of people calling and texting me from the US, i.e. it won't be noticeable to them that I'm traveling internationally when they text or call, or when I text or call them back.

Would T-Mobile (using an iPhone 7 or newer) work fairly seamlessly? If not T-Mobile and iPhone 7, any other suggestions?

See More: International traveling - is T-Mobile seamless?