I am getting an ipad next week and plan to tether my iPhone 4 to my iPad during work. I am an outside sales rep and work on the road, in and out of customers all day. I was thinking more about tethering and instead of turning it on and off every 15-30 minutes do you think I could just keep my phone and ipad tethered for most of the day? I am only on the road about 4-5 hours daily. I guess my main concerns are: 1) Could this cause my phone to overheat or cause any problems? I plan to try to use iTether instead of mywi to save battery life, and I also have a car charger, so Im not TOO worried about my battery 2) I have an unlimited data plan with AT&T and Im not sure how much data I would use on a daily basis, but do you think this would cause any problems or raise any red flags with AT&T? Pls let me know your thoughts. Thanks!