[ovrtaxt]

The radio idea makes sense. But why not take it a step further and impalnt a chip in the foreheads of Muslim zealots, which picks up the signal? When the call goes out, a little red LED on the chip starts to flash, and everyone will know that it's time for prayer.

Of course, a GPS transponder would also be a nice accessory on the chip, and maybe a tiny bit of C4 if the mullah decided that a remotely detonated suicide bomb is needed...(Of course the government would have access to the source code)

Isn't technology fun?

[DonaldDuke]

When the call goes out, a little red LED on the chip starts to flash

How about a bone conductor speaker implanted right behind the ear? Jack the imam caterwauls up to 150db, broadcast, and the good muslims can keel over on their prayer mat. As soon as their heads stop vibrating, that is.