phone case - locked. nano technology fully protects the phone against illegal connection, eavesdropping, tracking. the case-locked looks like a normal case for smartphones and mobile phones, however, it has a unique additional function, namely, the interior finish of the case is made of a special material with a nano-carbon fiber structure, which ensures effective absorption of high-frequency radiation, which, in turn, blocks the radio and electromagnetic frequencies. if a mobile phone or smartphone is placed in the special compartment of the case, after a few seconds the device loses connection with the base station of the mobile operator, which in turn protects you from the risk of unauthorized interception, recording or transfer of important data stored on your mobile phone or smartphone, using wi-fi, gsm or 3g / 4g / 5g networks. nor will it be possible to use your mobile device as a microphone for remote interception. scope - currently there are several illegal programs for establishing unauthorized remote connections to your mobile device. by placing your phone in the special compartment of the case, you can be sure that the information stored on your phone will be protected, and no one will be able to intercept your conversations. principle of operation - to use a mobile device in frequency blocking mode, the device must be placed in the second partition. but if there is a desire to use the case as a normal case for smartphones and mobile phones, the device must be placed in the first compartment.