How does this t-mobile iphone5 deal work exactly?

I have a t-mobile galaxy s2 which I upgraded to back in Nov 2011, I want the IPhone 5 but I'm confused on how things are going to work, will I be eligible for that whole $90 dwn $20 a month gig even tho I'm not quite eligible for an upgrade? I'm curious because when I go online to see my upgrade options, it says I'm responsible for $159 dwn and $17.50 a month for 24mnths, can somebody please clarify this for me

Thats on a contract deal it sounds like. I like no contract and buy the phone because its cheaper in the long run. I got my iphone5 here http://www.solavei.com/oklahomacity and only pay 49 a month for everything on t-mobile 4g network. Thats cheaper than you can get it from t-mobile… Like 20 bucks a month cheaper

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