1. Domestic GSM and CDMA networks, due to European restrictions on our export encryption algorithm, have not opened the encryption function, and the transmitted data is not encrypted;
2. The inherent loopholes in the security mechanism of GSM and CDMA - one-way identity authentication, that is, only the network identifies the mobile phone, and the mobile phone absolutely trusts the network, making it possible to pretend to be a legitimate user to intercept;
3. The radio waves emitted by the mobile phone can cross-modulate and transmit the electromagnetic wave information of the surrounding electronic equipment, causing leakage;
4. The mobile phone is an eavesdropping device. The mobile phone in the call state will send all the surrounding sounds to the receiver; even if the mobile phone is turned off, as long as the battery is not removed, the surrounding sounds can be intercepted by the proprietary eavesdropping device one by one. Obtain;
5. The main technology and internal chips of mobile phones are imported, and it is difficult to guarantee that there are no technical secret doors in these mobile phones. These background technologies include remote switching on and off the phone, reporting the location of the phone without displaying it; making calls unknown to the user, and even recording the content of the call and sending it to a third party;
6. The United States has established a global electronic monitoring network system. People use mobile phones to talk, almost all of them have to go through its "filtering".
