Can someone please validate (or dis-prove) the following information I found online: Question: Let's say I bought my iPhone last year and I want the iPhone 3G. Can I give my old iPhone to my sister or sell it on eBay? Answer: No, once an existing iPhone user activates service for an iPhone 3G, their first-generation handset will be unusable as a phone. You won't be able to replace it with another AT&T SIM card and use it to make calls. This also means that you can't buy an old iPhone on eBay and expect to activate it on AT&T's network. However, you can use it as a media player and a Wi-Fi device for browsing the Web. Does this mean that if in a year I want to upgrade to the newest and greatest that comes out down the line I can't resell it? That would totally blow. Is this the case?