We get posts in the forum which point out unlock sites on a weekly basis. This one (unlocksearch.com) seems to be a bit dubioous. I tried a few models and every single one said it was “unlockable” for only 3.99. After a bit more faffing about I decided to make up model names and, lo and behold, it can unlock a HTC Banana Phone.
Sites like this annoy me, because they’re not selling an unlock code at all – just an “Unlock Report” – which will no doubt just tell you to browse the web and find somewhere that actually unlocks your phone.