GSM is the most common frequency range used to interfere mobile phone networks and mobile communications. It includes four main frequency bands (850MHz, 900MHz, 1800MHz, 1900MHz) and uses many smaller standards (like UMTS, CDMA2000, Nextel, TDMA, AMPS, W-CDMA PCS, etc.) in different countries around the world. The main advantage of GSM is that users can choose the quality and low cost of SMS from more voice choices.
The current GSM blocker is not only used for GSM interference, but also shields GPS and WiFi signals. With advances in technology, people can track your location not only through GPS satellites, but also by tracking cell towers. There is a modern assistive GPS technology. It combines GPS satellite tracking and mobile phone tower position triangulation to quickly and accurately find your specific location, so that you are constantly being monitored. It is embedded in many new microchips in tracking devices and phones.In order to fight this complicated device, we need the jammer to interfere with GSM and GPS signals.
Most importantly, these GSM jammers are affordable and portable, they not only can interfere with gsm signals, but also block 3G 4G WIFI GPS signals, protecting your privacy and location at all times.