Can I use a GSM sim card in my iPhone 7?

[SarasotaJoe]

I am planning a trip to Italy and Croatia and want to figure out the bast way to use my Verizon iPhone 7 to call and get calls from the USA

Do I buy an GSM Sim card?  Do I use What's App or Skype? Do I just buy a tosser when I am there?

[vzw_customer_support]

Congratulations on your trip. We want to help you prepare yourself. When using a SIM local to the region, you will need to contact the provider to verify compatibility with your device. The first step is identifying the carrier. Once that is complete, please contact them with your device model for the answer. Safe travels to you.