Cellular jammers specifically block cellular signals, meaning cellular devices. If a jammer is active, your cell phone will not have a network signal. Wi-Fi jammers create a frequency to block Wi-Fi connections and disable devices "from connecting to 3G, 4G, GPRS, or cordless Wi-Fi networks.". GPS jammers block satellite frequencies.. The use of signal jammers is illegal in the United Kingdom under the Wireless Telegraphy Act of 2006. According to this law, anyone who intentionally disrupts a wireless signal is liable to imprisonment for up to two years or a fine, or both. Furthermore, it is also illegal to manufacture, import, sell, or rent signal jammers in the United Kingdom.

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Legal Compliance: When using a mobile phone jammer, you must ensure that you comply with the UK Telecommunications Act. This means that no provisions under telecommunications law may be violated, including not interfering with the normal functioning of public communications networks. Special attention should be paid to when using a mobile phone.. Cell phones can be jammed via interrupting any of these signals at a given point. Because the distance to base station is larger than the distance to mobile phone that needs to be blocked, it needs less energy to block signal from base station to phone. The commercial hand-held cell phone jammers block frequencies between 800MHz to 1900MHz.