Ok I'll admit it I've been watching Engadget's live blog of the iPhone 4 debut. Something interesting stuck out at me however. In one of the keynote slides, Jobs pointed out the iPhone actually gets better battery life while on wifi vs 3G. Normally I switch wifi off when I'm not using data, syncing will still access 3G when I'm at home and I'll do occasional browsing at home as well. Would I be better off accessing data using wifi when available rather than 3G? I guess a better way to pose the question is, does the 3G radio use more power then wifi?