On the AT&T iPhone, you can turn the 3G off and go to their slower EDGE service to conserve battery life (reported to DOUBLE the talk and standby time). I see that on the Verizon iPhone, there's no alternative to 3G other than to turn off data altogether. I realize that it is a big sacrifice to speed, and most folks need it fast all the time, but sometimes I just need to check email and would like to have longer battery life for the phone. Too bad there's no alternative to either 3G or OFF.