A system for allowing remote access to cellular telephone programming through the PSTN is disclosed. The system includes a specifically configured remotely accessible cellular telephone (RACT) and a host system for managing a multiplicity of such RACTs. The RACT of the present invention may be configured either as a cellular telephone itself, or as a kit which, when combined with a conventional cellular telephone, forms a RACT. The RACT includes a signal detection circuit configured to detect a unique identifying signal that the host system generates and is not commonly found in conventional data communication traffic. RACT programming includes conventional cellular processes so that remote accessibility features do not impact conventional operation of a cellular telephone. Moreover, RACT programming includes automated call origination and call answering processes which minimize the impact of the present invention on cellular customers and on the public cellular system. RACT programming further incorporates a security system which severely hinders unauthorized tampering with RACT programming. The host system manages a comprehensive database which includes information describing the configuration of all its client RACTs. Host system processes are designed for compatibility with the corresponding processes in the RACTs. Hence, a communication system in which predefined messages are successfully passed between the host system and RACTs is described.