Can you still do things on and Iphone if you don't have a phone plan?

I want an Iphone for facetime, the camera, the music, apps etc. When you buy the phone and the charger can you still do all these things or do you need a phone plan? I would also want to text but I don't think I can do that without a phone plan. My dad won't let me call on it until I'm 12 and I'm 11:( So can somebody give me the details?

Complete waste of money. Get an iPod until you can have a cellphone.

Yes you can use it only with Wi-Fi but then why not just get an ipod touch instead?