Hi, To save costs and avoid the new (and highly expensive $40/smartphone) plan, I was thinking of switching to a small 4G tablet and using Google Voice and GrooVe IP to make it into a nearly full-fledged phone. My concern is battery life. If the 3G/4G data connection is constantly left on without sleeping, how long can the tablet last? I've only seen stats for the Tab's video and standby time, and I'm not sure how an active 3G signal compares. Also, are there any other issues you can foresee? Thanks!