Product Detail From HomeDepot.com With Free Shipping With Sales & Deals $9.05 go to store HomeDepot.com (100,000+) Brady 122739 Security Sign, 10 Height x 14 Width, Black and Red on White Brady No Cellular Phones" signs prohibit cell phones and two-way radios where the radio frequency, noise or distraction is a concern including blasting areas, quiet rooms, hospitals and other sensitive areas.