Switch US SIM to European SIM Card?

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Android Central Question

I plan to buy a Note 8 unlocked, but use AT & T as my carrier. I currently use an IPhone 6 Plus. Two Questions:
1--can I simply switch the Iphone sim into my new Note 8? Is there anything I need to do in terms of registering with the carrier when I do this. I currently use AT & T and plan to continue with them.

2--I travel to Israel and Europe once or twice a year and would like to be able to purchase local SIM cards there, pop them into the phone, and use the local card while I am in Europe/Israel. Will I be able to do this with any unlocked Note 8 that I buy in the US?

Thanks
Gerry