Legal Device to Tell Cell Phone Users to Stop

A product like this would be more of an annoyance for the employees at the facilities instead of the offender. Airplanes now require cell phones to be off on all flights I have been on. I can see airlines using this to verify that all phone are off maybe if tweaked for extra sensitivity for the handshake signal between idle cell phones and the tower carrier that ques phones occasionally to update them and trade off tower identifications with them. This lower level beacon communication is how your cell phone displays roaming etc when you move out of your normal area etc.

I agree it would annoy me as well it would be better to let them answer the phone, As you say it would be going off every time the handset picked up a signal.

The main reason though for posting it was because there was a question about jamming cell phones which me and another said was illegal in us and uk.

and this i thought would satisfy the guest

The original thread was removed for obvious reasons.

Just trying to be helpful

"it monitors Cell phones in hospitals"

Funny, when you mention it, have you ever noticed, that doctors are some of the worst offenders.

true.

perhaps doctor have told their phone not to annoy

Similar devices have been available for a long time for use in theatres, concert halls and TV studios. Useful to check the audience don't have phones on before the performance starts.

What about cell phones that have 'auto update' lol And other features that are not apparent to the user...