these days you need quite complex software and sometimes even hardware to unlock phones.
Its not free because if the code or the maths used to generate it has been leaked out of the mobile phone company, the hackers doing so are at serious risk of having their door hammered down by feds, often in foreign nations where such feds have guns, as there is so much money at stake – its not just individuals what unlock phones but gangs who split bulk PAYG packs of phones and SIMS, so the deal with the provider it is locked to and the handset company to share revenue is lost.
£10 is cheap for the risks being taken by some folk doing this thing. Even in Blighty you hear of these shops being closed down and everyone from feds to Trading Standards and Border Agency rinses the place and Ramesh and Pawel end up in jug (and then have to explain themselves to their parents, which is often worse than dealing with the authorities!)
