Today, many phone calls have at least a minimal level of encryption provided automatically by their cell phone network provider. In fact, it's not uncommon to see 256-bit AES being used by network providers to encrypt phone conversations. While adding an additional layer of protection by utilizing a phone call encryption application can add a higher level of protection in areas where the inherent encryption is deficient and certainly for those working in government positions, this alone will not address threats from malware, direct attack, physical compromise, etc.
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