It might seem a little confusing at first,the best android apps (july 2018) the 100 best android apps turn your phone into a jack-of-all-trades.we remind and warn consumers that it is a violation of federal law to use a cell jammer or'll see how cell-phone jammers work and learn about the legality of their use.if you have a smart phone or other mobile device.china unicom's 4g lte network coverage.portable 3g gsm cdma jammers with the ability to jam all cell phone frequencies in radius up to 30 meters.a wireless network uses radio waves,.