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Low power gsm jammer can block calls within about 30 feet

The portable gsm jammer featuring universal and handheld design can block global mobile phone networks within the range of 0.5-10 meters, including GSM900MHz, GSM1800MHz, SM850MHz/CDMA 800MHz and 3G networks (UMTS/WCDMA).

Answers

There are two types of jammers: the first is usually a smaller device that can block signals from a cell phone tower to a single cell phone, which can block a radius of about 30 feet (9 m). Mobile phones in this range have no signal at all.
The second type of mobile phone jammer is usually larger and more powerful. They operate by blocking the transmission of signals from satellites to cell phone towers.