1. A communication system, comprising: (a) a communication device having a wireless personal area network interface and a radio frequency transceiver configured to communicate digital information though packets, the radio frequency transceiver supporting communications though transmit bursts; (b) a personal area network communication port configured to pair the communication device with a smartphone; (c) at least one automated processor, which is configured, in a first mode, to: define, within the smartphone, a communication destination representing a user-selected telephone number from an address book comprising telephone numbers within the smartphone; define, within the smartphone, first digital data comprising at least one of a text message and geolocation information; transfer the selected telephone number and the first digital data to the communication device through the wireless personal area network interface; negotiate, by the communication device, a communication over a radio frequency control channel with a first other communication device based on the selected telephone number; communicate, by the communication device, the first digital data over a radio frequency data communication channel to the first other communication device; and receive an acknowledgement, by the communication device, of receipt of the first digital data from the first other communication device; and (d) the at least one automated processor, which is configured, in a second mode, to: determine a self-identifying telephone number for the communication device; monitor the radio frequency control channel for attempted negotiations for a communication addressed to the self-identifying identifier; receive, by the communication device, second digital data comprising at least one of a text message and geolocation information over the radio frequency data communication channel from a second other communication device; transmit, by the communication device, an acknowledgement of receipt of the second digital data to the second other communication device; transfer the second digital data from the communication device to the smartphone through the wireless personal area network interface; and present, within the smartphone, the at least one of a text message through a text interface, and the geolocation information through a map interface.