International can mean two things. Most easily dealt with is that the supplied charger, may have some sort of European power supply. You can easily replace that, or buy a pin converter. All European phones I’ve seen, will work on US power. The reverse is not necessarily the case.
The main problem is that some of the frequencies used by the networks, are not the same as in the US. Having said that, I have four U.K. iPhones, ranging from a 5 to an 8. All work great in the US. BUT, most countries of the world us a standard called GSM. They have SIM cards, which can be moved between phones. My US network uses SIM cards, so no problem, the big issue is VERIZON compatibility. I think that the latest VERIZON standard also uses SIM cards, but they may not be compatible.
I would stay with iPhones and nothing older than a 6. If your not on VERIZON, you should be o.k. But talk to your US provider about buying a SIM.
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