How to use my old iPhone as a phone again?

I just got a cheap little Pantech for a month or 2 until I get an android. But I really hate this phone already and I'm only a few days into the 2 months, so how can I use my old iPhone 4 as a "phone" again? I know I can't call or anything, but is there any good cool apps to make it as much as a phone again as possible? I really want to limit my actual phone usage because I dislike it so much.

Skype for video calling and voice calling.

"KIK" messenger I have found to be a great replacement for texting