How Can I Block a Cell Phone Signal?
If you have ever been in a movie theater and a cell phone starts ringing during the best scene, then you know how annoying it can be. Cell phones have become ubiquitous; while undoubtedly they have made our lives more convenient, in other ways they can be a nuisance. Fortunately there is a solution: You can use a cell phone jammer to block their signals.
Cell Phone Jammers
Buy a cell phone signal jamming device from eBay, Amazon or any online spy and gadget site. These devices will block signals anywhere from 10 to 200 feet, depending on the model that you decide to purchase.
Turning It On
When you turn on the device, it will block out signals at the frequency that cell phones generally broadcast. This will show up on the other person's phone as a low signal, and he will have no idea that he is being jammed. The devices come with a rechargeable battery and can usually be used for up to two hours. Most of them also come with car adapters.
Use It Sparingly
Be careful of where you use these. Using a cell phone jammer in places like movie theaters and restaurants is probably OK. But having them turned on when you're near the scene of an accident could prevent someone from calling for help. Also, if you use them in a hospital, it could interfere with equipment. Different states have different laws regarding the use of these devices, and generally the stronger cell phone jammers can be sold only to government agencies.