What can I use on an Iphone with no service plan?

My parents got upset and put my number on an old phone and powered it off. I now have an iphone with no service plan on it and I was wondering what I can still use on it. Can I use imessage and how. Also I know facetime works off Wi-Fi so how would I use that?

Everything expect, texting calling and the data plan.

There are some apps that allow you to call people as long as you are in the Wi-Fi Area. Also there's am messaging app also so basically the iphone still works

You can still use it as long as it is on Wi-Fi. All of the games and face time etc.