I had to unlock my old mobile phone, as my new phone was stolen from out of my lorry ( when I was in the back unloading...

I tried T-mobile to ask how I can make my old phone sim-free for my new Tesco sim and they said it was a £20 charge. The kind chap recommended a free website to go to ( www.forum.xda-developers.com ) which is full of tech minded people that show ways of making phones sim-free. The only phone they cannot do is the HTC Wildfire, so guess what my phone is.....pfff
Looked on eBay, tried the Unlock Doctor. Well 99p and a couple of hours later I had the code to put into my phone and Bobs your Dad's Sister.
Tesco, T-mobile and the Unlock Doctor deserve a recommendation, although the T-Mobile website is shite.