From what I understand, an Al Quaeda soldiers was sent in one direction with a cell phone and a cassete player [with a tape of Bin Laden's voice recorded on it] and Bin Laden went the other direction.
The Al Qaeda soldier made many calls to Pakistan numbers using the cell phone and simply played the tape into the cell phone. As a result, the NSA intercepted the calls and determined that Bin Laden was using the phone and heading in a specific direction. All firepower was focused in that direction.
Could be exactly what is happening here. We'll see.