I was using my iPhone when I got to thinking about how amazing it is that so much information can be transferred all with electromagnetism. I was in a room with 500 other iphones and I could not connect at all. is this because AT&T could not support 500 people on the same tower? if someone with a verizion phone walked into the event would their phone work great? is there a limit to the amount of information that can be transfered on the Eletromagnetic field within a space? What frequencies do cell phone use? Can more than 1 cell phone be on the same frequency? How are there enough frequencies to go around?