My friend who DID have an iPhone that he bought off of eBay that was ‘jailbroken’ finally decided to become ‘legal’. We played with this ‘free’ wifi calls for nearly 6 months. He did save a few coins from his sprint bill, did make and receive calls for free and had practically all of the other goodies on the iPhone working OK, but its not quite there yet. Meaning, we estimated that about 60-70% of all calls were either dropped or not received by him. This made the iPhone really not usable for business and a bit annoying. So, after nearly 6 months, he walked into an ATT store and is now totally legal. We enjoyed hacking the iPhone and making it do what its not suppose to do, but in the end, getting phone calls was key and until wifi gets stronger and the hand-offs’ more seamless, we will wait.