I don't know why AT&T dropped the EDGE requirement from the iPhone, but they did. If you want to save $20/month ($240/yr, $480/2 yrs) and skip the EDGE data and go wi-fi only, that's now your option. Doing so removes your ability to use visual voicemail and your rights to 200 free messages, but you can add a different SMS plan once EDGE is dropped. If I was to drop EDGE, I'd probably drop AT&T too -- I'd spend some of that money I'd be saving on breaking my contract and unlocking my iPhone.