[meyer]

Can’t GPS or someother tracking practice follow his everymove? They could find him at Camp David or where he travels at any place or time. I don’t know how terrorists set off bombs thru cellphones, but I would not want to be carrying one at anytime. If they can’t do that now, I am sure they will figure it out.

The tracking is easy, unless his particular Blackberry has been rigged to eliminate the GPS function (Secret Service would probably insist on that). Even then, it could still be loosely tracked through cell tower triangulation, but that's not as precise.

Terrorists have used cell phones to set off bombs, but they can't make the cell phone itself explode unless they can rig it with explosives. Then again, I'm not sure that terrorists would have any reason to harm an ally.

[null and void]

I bet some clever soul knows how to turn on the microphone without alerting the owner...