Which company is the cheapest?

I was trying to look up which company would be cheaper to purchase an iphone 5. Sprint, Verizon, AT&T. Or TMobile.

I would be starting a new contract with them and I'd be the only one on the bill.

Every website tries to compare which is cheaper compared to other companies but they all say something different.

I'd want unlimited everything.

Use a piece of paper (maybe more than one)
and a writing implement (pen or pencil),
along with a calculator, to figure it all out.

Five years ago, I spent several days researching providers,
phones, plans, and all the other important details,
then did some math.

I decided on a Motorola V195 phone and T-Mobile prepaid service.
So far, so good.

Your results may vary.