Where can i get my iphone 4 unlocked cheaply?

I have an iphone 4 locked to o2 uk and want to use it on vodafone where can i get it unlocked cheaply and in uk ££££ss

Most big shopping centres have stalls that sell covers for phones and chargers ask and see do yours do an unlocking service it may cost you 10.00 to 15.00

If it is out of contract
O2 unlock it for free.
http://service.o2.co.uk/IQ/SRVS/CGI-BIN/WEBCGI.EXE?New, Kb=Companion, question=ref(User):str(Mobile), CASE=17424

or over a year old on PAYG, it costs 15 pounds

and more importantly, is done officially keeping your warrenty
and if you reload /reset/upgrade it with iTunes you keep it unlocked

Seems a good deal to me.
(even a mobile shop/stall will cost you 10 pounds at least - and no warrenty)

You can get your iPhone4 locked to O2 network safer and easier through remote unlocking method. It is also an affordable method too. You can get the remote unlocking for an iPhone4 from http://www.wickedunlock.com/apple-iphone-4/rs11wp9/ at affordable cost.
Here are the steps for unlocking an iPhone4,
1. Wait for to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 4 phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 4 to iTunes with a NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 4.
6. Disconnect your Apple iPhone 4 and reconnect it after 10 seconds.
7. Your Apple iPhone 4 is now unlocked.