http://www.stormcam.org/phone-signals/
Is there anyway to jam cell phone signals so they won’t work in a particular area?
Let’s say that I don’t want people to use their cell phone in my place of business.. Can I jam the signal so there won’t be any wireless communications in my property?
Yes. There are a number of companies that sell equipment to jam cell phone signals. Just look up “cell phone jammer.” Here’s one site:
http://www.phonejammer.com
These are illegal in many countries, however. Also, some people think it’s a lawsuit waiting to happen if phones are blocked from calling for help in an emergency.
CTIA: Wilson Sleek boosts cell phone signals in car or at home