Can you unlock a Japanese iPhone to work in the UK?

I'm planning on buying an iPhone 4 second hand but it won't work in the UK! I was wondering if it could be unlocked?

I'm not sure I try to do the same in Israel but it doesn't work

Why
The pre-owned so no WARRANTY will be discontinued later this year 2013

On 12/09/2012 Apple release IP5 drops IP 3GS
Later this years releases IP5S drops IP4

The IP4 whose distinction was to be the first IPhone to have camera flash

There are NEWER phones BETTER phones and CHEAPER phones, NEW= WARRANTY, than overpaying*** for essentially a logo,

Some seeing the "affordability" of the IP4 are starting contract NOw? Which means in 2015 when their contract ends they will be using a 5 year old model and we UK are practically 4G

*** http://www.itproportal.com/2012/09/06/8gb-iphone-4s-version-be-introduced-iphone-5-launch/#ixzz2E

If you get it unlocked 1st it will work.
if not trade it for unlocked one.

You can get it unlocked from any commercial vendors online like http://www.prounlocking.com where they use remote unlocking method to unlock which serves best and safest mean for Iphones.

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