Alternatively, A person could jam the 3G or 4G bands by pumping lots of white sound into them, making it far too noisy to determine a link, and telephones will downgrade searching for a usable signal. LTE provider downgrading is roofed in detail at the end of Section three.five. In https://www.shoghicom.com/all-products/wideband-passive-gsm-monitoring-system