Wanted to see if any one else has experienced this, or may have some input. I was working in the building today (NY, AT&T) and lost the cell signal completely, while my friend who has an AT&T service as well and a different phone that shall not be named , had at least couple of bars and was able to receive and make calls. This was very frustrating as I had to put my phone in to flight mode, so not to drain the battery completely. I got the service back one i left the building. This has happened to me once before when i was in some bar, where couple of my coworkers had their service from the same provider. So if anyone has any input on this, I would greatly appreciate it.