A mobile phone, including a modular communicator including a modem for transmitting and receiving voice and data communications, a communicator connector for making electrical connection with a jacket for the communicator, when the jacket is pouched in the communicator, a communicator display screen for displaying information, and a communicator controller (i) for executing programmed instructions for operating the modem, (ii) for transmitting data to and receiving data from the communicator connector, and (iii) for generating the information displayed on the communicator display screen, and a jacket for the modular communicator, including a mechanical jacket housing including a top section and a bottom section connected by a hinge which enables the top section to fold over the bottom section, a pouch including a cavity into which the communicator may be pouched, and a transparent portion through which at least a portion of the communicator display shows when the communicator is pouched in the jacket and when the top section is folded over the bottom section, a jacket connector that mates with the communicator connector to make electrical connection with the communicator, when the communicator is pouched in the jacket, and a jacket controller for transmitting data to and receiving data from the communicator controller, via the jacket connector.