How much is it to unlock iphone 4?

I recently bought a pay as you go phone from vodafone, but i would like to unlock it, how much do you reckon it would be in the uk

It depends Upon which Network It locked Now and in which Country!
You can get the Network Remote Unlock Service at here
http://www.prounlocking.com/supported-phones/rs8wp7/ and Unlock the Mobile from the Network Lock… Check Remote Unlock service for Your Network Lock in the List.
if you know how to do it, its free. If you don't i'd suggest looking at youtube videos they'll show you.

The best option would be to use an official carrier granted unlocking. If you can't get it done through your provider, you can use an online service, just make sure it is a service exactly for your country and provider, many services will tell you it doesn't mater but it does.

To factory unlock a Vodafone UK it is about $70-90 US. To jailbreak it, it is free, but more risky

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