If I buy a Iphone 4s In America can I use it in the UK?

Hi there basicaly I have bought a Iphone 4s from america and have received it as they had a sale, anyway when its in the uk its blocked from service (no signals or calls), could I unblock it? Alot of my mates say you can jailbreak it to get signal back, Can any one help me out?

Added (1). Oh Its locked to a service called American Sprint

Using someone else's upgrade? (Verizon)?

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I'm not on her plan nor do i even have verizon.
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Can I sell my Iphone if I cancel my contract?

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Can she use it? Can they track the phone to her?

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Recommend a wireless all-in-one printer for my Apple products?

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