I want to switch my iPhone 4S?

My cousin gave me a iPhone 4S and its on atat my current provider is cricket and I want to switch it to tmobile so I want a plan with unlimited everything btw I want to know what it costs and if I should do a contract

The cost can be found at the site and store for I have Verizon. Although, considering that apple will release a new phone this year or the next a 2 year contract would hold you back from that.

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