Can a cell phone jammer be used to block multiple signals?

Have you heard of cell phone jammer? If you don’t ask, you may use your cell phone a lot. Of course, Jammer is a product that shields radio signals from electronic products such as mobile phones, GPS and WIFI. More specifically, a mobile phone jammer that suppresses communication with a mobile phone or the like emits interference radio waves in the same frequency band as the frequency band used by the mobile phone or PHS, and deteriorates the radio wave condition received by the mobile phone. It is to prevent the use of mobile phones in the surrounding area. Even if eavesdropping devices using mobile phone terminals (including smartphones and iPhones) or SIM card eavesdropping devices are installed indoors or in cars, it will block communications (outside the service area/interference) to prevent eavesdropping. By transmitting high-power radio frequency signals within the same range as the mobile phone communication signal that needs to be shielded, interference may occur in mobile phone communication (in a specific area). This cell phone jammer can use some to select a series of cutoff frequencies and selectively block only these frequencies. It can be used to prevent GSM, CDMA, 3G/4G and other popular mobile standards from working.