I work at a hospital; typically during the work day, there are between 5 and 10 stories of concrete, electrical equiptment, and medical instruments between me and the open sky. As my hospital doesn't specifically support ATT, I have no cell-phone service in the large majority of the hospital. When I first started using my iPhone at work (just leaving it on standby with the occasional wifi checkup on the 'net) I was getting [what I consider to be] terrible battery life. Just leaving the phone on standby and using it for non-'net things and a rare glance at the internet would have the battery at 15%-20% after the work day or so, which is anywhere from 8 to 10 hours. "Okay," I thought, "It's just how the phone works." Well, I decided to give something a test. I put the phone on airplane mode during the work day and used wifi for 'net access more than I typically did. The battery didn't budge throughout the whole day! So it seems that it was the "phone" part of the iPhone that was draining the battery. Strange... Also, to note, now that I'm in a bit of off-time and have used the phone away from work more, it seems that only in my workplace does the phone's battery life suffer as described. I can't give any specific usage numbers at this point, but is it possible that either the prolonged lack of cell-phone signal or something in the hospital's equipment was pushing my iPhone to use significantly more battery than normal?