How much would the iPhone 5 cost monthly?

I'm looking to buy an iPhone 5 for T-Mobile. I was wondering how much monthly would it cost if I put down $100.00 and pay $20.00 for the phone monthly for two years. How much would everything else cost? And Should I just get the Samsung Galaxy S4?

Why not use Verizon, get a 2 year contract and get an iPhone 4 for free.

Answering the question of how much an iPhone costs isn't as simple as looking up whatever Apple's latest listed iPhone price is. That's because the iPhone includes a monthly service fee, as well as different costs for buying the phone itself. So figuring out how much an iPhone costs requires some math.

Actually, it will cost lot if you pay monthly $20.00 for two year. In my opinion the iPhone 5 and Samsung Galaxy S4, both are the new and better mobile but the iPhone 5 has some problem so, I would like to convince you that the Samsung Galaxy S4 is the best and nice for you. And it can be bought with the low cost. It is cost less than iPhone 5 as you pay $20.00 for the phone monthly for the two years.