Can I use american iPhone in europa?

The phone is compatible with European networks, and all Apple charger bricks will work worldwide with a plug adapter.

If your phone is not carrier locked you can use a local SIM and get a local number. Alternatively, ask your carrier what they offer in the way of roaming plans. Do NOT use the phone with your carrier’s SIM without a roaming plan or it will bankrupt you.

If you mean Europe, yes.

But.....you need to check with your carrier to see if they offer an international calling plan that you can add to your phone, rather than having to pay a fortune for every call that you make or receive.

For example, AT&T offers an international plan that allows you to travel virtually anywhere for an additional $10 per day while you are traveling. If you don't use the phone on a given day, there is no charge for that day.

There is no cell coverage on Europa, one of the moons of Jupiter.