Can I unlock a spirnt iphone 5 in england?

I have the opportunity to buy iphone 5 on sprint and I've heard they use slim slots. So, would it be possible for me to unlock it in England and use a English network on it e.g three, giffgaff or T-Mobile. Also if its possible how much would it be to unlock it?

If there's a company in the UK that uses a CDMA network, you might be able to use a Sprint phone.

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