Going to Italy in a couple weeks. I called Cellcom to ask if my Galaxy S6 was locked? They said no. I told them I was going to Italy and want to buy in Italy a sim card for local phone calls and GPS. They told me that my phone was CDMA compatible and other phone are GSM (whatever that means?) and they are not sure my phone will work with a Italy purchased sim card.

I am a geologist and woodworker and have no idea what they are talking about. But can anyone answer whether my phone will work.

Thank-you very much.