Not sure if this will help anyone.
I rang my network (Vodafone) and they wanted £20 to unlock my sisters mobile phone.
I thought £$%$£$ that lol ,after a search i found http://www.sim-free.net
which looked like a safe/secure site compared to the rest available.
For £5.99 i thought i'd give it a go, and hey-presto within 5 minutes i had received the unlock code by e-mail and the phone was unlocked.
Only downside, now i have to chase my sister to get the £5.99 back lol, but if i don't get it back, it's better losing £5.99 than £20 lol.
Anyway hopefully it is usefull for someone.