The reason why the mobile phone can call and surf the Internet is that the wireless channel can be established between the mobile phone and the base station through wireless electromagnetic wave, so as to establish a connection with the whole communication network. Linear electromagnetic waves have different working frequency bands. Different frequency bands have different uses, some for police, some for military and some for civil use. The 2G / 3G / 4G / 5G network frequency bands of the three major operators are well regulated. Both mobile phones and base stations can only use the specified frequency band for communication.

If the mobile phone can not communicate, it is to turn off the base station. This situation is unrealistic. Another is the signal jammer. As long as the equipment is started on the occasion of need, the mobile phone can not communicate within a certain interference range.

The equipment is started in some places, but 5g signal is still available. Is there a fault in the on-site machine and can't work normally. Is the purchased equipment old and used for a long time? It can only shield 2G / 3G / 4G network frequency band. The Signal Jammer does not support shielding 5g signal

In this way, we can upgrade the old one and add a 5g shielding module in the original machine, so that the new 5g shield can be used. We can also add a high-power 5g shield according to the site environment without dismantling the old equipment. Or we can purchase a new batch of 5g shields and new equipment to shield 2G / 3G / 4G / 5G network frequency bands. We can also reserve module positions to add modules for later upgrades.