A mobile cellular communications device comprising: a housing; a cellular transceiver carried by said housing; at least one audio transducer carried by said housing; a memory carried by said housing; and a voice alteration processor carried by said housing and coupled to said cellular transceiver, said at least one audio transducer, and said memory, said voice alteration processor configured to: download voice alteration code and at least one set of voice communications parameters from a mobile application store platform, each set of voice communications parameters comprising a pitch value, a time constant value, a reverberation value, an overtone value, and an equalization value; store a plurality of contacts in said memory, each contact comprising preferred frequency range data; selectively alter voice communications based upon an identity of a calling user, the respective preferred frequency range data for the calling user, and the at least one set of voice communications parameters, the altering of the voice communications being two-sided and including shifting at least part of the voice communications from a first frequency range to a second frequency range based upon the preferred frequency range data of the calling user, and; add false background sounds to the altered voice communications. a housing; a cellular transceiver carried by said housing; at least one audio transducer carried by said housing; a voice alteration processor carried by said housing and coupled to said cellular transceiver, said at least one audio transducer, and said memory, said voice alteration processor configured to: download voice alteration code and at least one set of voice communications parameters from a mobile application store platform, each set of voice communications parameters comprising a pitch value, a time constant value, a reverberation value, an overtone value, and an equalization value; store a plurality of contacts in said memory, each contact comprising preferred frequency range data; selectively alter voice communications based upon an identity of a calling user, the respective preferred frequency range data for the calling user, and the at least one set of voice communications parameters, the altering of the voice communications being two-sided and including shifting at least part of the voice communications from a first frequency range to a second frequency range based upon the preferred frequency range data of the calling user, and; add false background sounds to the altered voice communications. download voice alteration code and at least one set of voice communications parameters from a mobile application store platform, each set of voice communications parameters comprising a pitch value, a time constant value, a reverberation value, an overtone value, and an equalization value; store a plurality of contacts in said memory, each contact comprising preferred frequency range data; selectively alter voice communications based upon an identity of a calling user, the respective preferred frequency range data for the calling user, and the at least one set of voice communications parameters, the altering of the voice communications being two-sided and including shifting at least part of the voice communications from a first frequency range to a second frequency range based upon the preferred frequency range data of the calling user, and; add false background sounds to the altered voice communications.