How can I unlock my HTC One V locked by 3 (UK Carrier, www.three.co.uk)?
Your local independent phone repair shop or market trader will probably SIM-unlock your phone for around a fiver, or you can probably negotiate it as a free service if you're buying something else there. It's not quite free, but if you value your time at all, it's probably cheaper than faffing around trying to do it yourself.