Hi, I will be upgrading to the 3G iPhone hopefully next week if they are available. Howewver, I have the problem of selling my old iPhone 16GB. It is brand new, 1 day old as I cracked my old iPhone and the insurance replaced it. I will be looking to sell on eBay to get about £250 for it. However, do I sell it locked to O2 or unlock it and sell. I am worried about unlocking the phone as I have never done this before and do not want to kill the phone. I am contemplating selling the phone locked with the necessary software so the purchaser can unlock it themselves. Any advice would be much appreciated.