Unlocking iPhone 5 For UK Use?

So on the Apple store (US) they have iPhone 5's for $199. However in the UK you won't be able to pick one up for less than £400. When looking into this the iPhone would only work on the networks AT&T, Sprint, and Verizon. These are all not available in the UK. If I bought one, would I be able to use it with a T-Mobile card? If not how much are we roughly talking to do an unlock for T-Mobile use?

The price you see there's the cost of the phone with a required two-year contract with one of those carriers. None of these would work for you in the UK, even the GSM models, because the frequencies are different from those in the US.

The actual cost of the phone without a contract is about $650. But they won't work for you anyway.

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