Quantum Shieldz^® Cipher™ is a self-sufficient voice encryption device that works with your personal smartphone. It uses an encryption key generated by a quantum random number generator (QRNG) to securely encrypt the user’s voice, completely blocking eavesdropping or unwanted recording through spyware. Quantum Shieldz^® Cipher™ converts the user’s voice into strongly secured encrypted data and transmits it to the smartphone, thus, even if one hacks the smartphone to attempt eavesdropping, it will be impossible to recognize the encrypted data. Smartphones would only need to be connected to public networks such as 5G or LTE data as no information would be stored. When the receiver uses Quantum Shieldz Cipher, the transmitted encrypted data will be decrypted into an audio signal, enabling a call.