Best Company to get Iphone contract with?

I want to get an iphone, but i'm a student on a budget. I want to know which company (AT&T, Verizon, T-mobile, MetroPS.) has the best contract deals. I want facts, like monthly payment, internet, minutes, texting. Thank you!
P.S- my sister got the iphone 4 last year with AT&T with limited internet, and she pays $90 a month. Are there newer deals now?

Well you can get an iPhone 5 with straight talk (the walmart brand) for 45 dollars a month but you will have to pay the retail price of the phone i personally have mine with AT&T and pay $60 for 6 gb a month plus the regular other phone stuff

If you visit Verizon Wireless.com you can chat online and see. Right now they are offering the iphone 4 for free with a 2 year contract!

Simple mobile. $50 a month unlimited everything. Just get gsm version and get it unlocked.

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