Modular system having cross platform master device

A modular system of devices, in which a (master) device can be combined with one or more of the other (slave) devices in the system to form a functional electronic device (e.g., handheld cellular phone, tablet computing device), having different functionalities and features in different form factors across various platforms. The master device provides control and/or stored data to operate the slave devices, to reduce redundancy between devices of various form factors and/or platforms, in a manner that provides additional or different functions and features in an optimized and/or enhanced manner as the form factor and/or platform changes from one to another. The master device is not functional independent without attachment to a slave device. The master device requires at least a peripheral component (e.g., a display module) provided by the slave device to become an overall functional unit.