As folks get more fed up with cell phone useage, personal jammers like these little gismo's sales may pick up.
Cellular Mobile Phone Jammer
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Small enough to fit inside a cigarette packet.
Battery Operated (9V PP3).
9-20 VDC input.
Quad-Band Compatible (Set up to work anywhere in the world).
One switch operation.
Up to 10 metre diameter.
Coolest and lowest priced jammer on the market.
Portable, Small, Compact and Robust.
Battery or Mains compatible.
To keep you away from noise or disturbance of unexpected cellular phone calls or text messages (SMS)..
World wide compatible.
To paralyze cellular phone communication links within an effective area.
No transmissions or receptions of cellular phone calls in coverage area.
All specified frequency bands will be paralyzed simultaneously.
The coverage area is a sphere area with its effective distance as a radius.
For use at meeting rooms, conference rooms, museums, galleries, theatres,
concert halls, churches, temples, restaurants, classrooms, training centers, factories, banks, trains, buses etc.
Easy to operate. No adjustment needed.
http://www.phonejammer.com/index..htm
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I understand some restaurants,theatres and hotels are using large jammers now.