[Drammach]

My main concern is that the terrorist no longer has to worry about smuggling his explosives on board in his shoes, or carry on luggage..
It could go in below-board luggage, or an accomplice could plant it on the planes interior or exterior in a seperate activity... ( plane maintenance, tire changes, clean-up, re-fueling, de-icing, etc.. )

All the "martyr" on board needs is a cell-phone to activate it.. and the correct phone # to call.

But, as Thackney pointed out, they don't take your phone, they just tell you not to use it..
Anyone inclined to suicide bombing probably isn't too concerned about rules on cell-phone use..

[Proud_texan]

"All the "martyr" on board needs is a cell-phone to activate it."

Or they could use the official airline approved phone since they won't have the pay the $10 a minute cost.

[Woodman]

Why couldn't someone just call the phone in the luggage from the ground (assuming it was on)?