Which iPhone should I get and how do I get it?

This might sound like a joke but I'm 18 an never payed my own phone bill my mom does but the problem is that we have t-mobile. I want an iPhone but she tells me I'm going to have to get my own. How do I do it and what provider should I use? I'm clueless and need all the help I can get. Also I'm kind of cheap and I'm jobless at the moment

You obviously can't afford it. So don't bother.

If you really want an iPhone, look for the older models. If you can wait hang on until a month after the iPhone 5S comes out. The old phones tend to tank in price around that time.

Iphone sucks. Get an android.