Iphone in Italy

Yes, if your carrier offers an international calling plan. Contact them to find out what options are available.

It's really nice to turn the phone back on when the plane lands in Rome and everything "just works".

vsaver wrote:

Will my iPhone 6s work in Italy in January 2023 without having to unlock it

See if your cellular carrier offers international service.

Also:

About cellular data roaming options for your iPhone and iPad - Apple Support