Mobile device for optical wireless communication

A mobile device comprising:

• at least one of a plurality of transmitters or a plurality of receivers, wherein:
• the at least one of the plurality of transmitters or the plurality of receivers are configured for optical wireless communication (OWC);
• the at least one of the plurality of transmitters or the plurality of receivers are arranged on at least three surfaces of the mobile device such that each of the three surfaces has at least one of a respective at least one of the plurality of transmitters or a respective at least one of the plurality of receivers, wherein
• the mobile device further comprises a processor programmed to control an OWC transmission or reception process;
• the processor is programmed to at least one of control or select the at least one of the plurality of transmitters to transmit OWC signals, wherein at least one of the controlling or the selecting of the at least one of the plurality of transmitters is determined by the processor using a weighting of received signals from the one or more receivers and at least one position or orientation signal received from a further component of the mobile device;
• and
• the receiver is configured to receive light at a first wavelength and the transmitter is configured to transmit light at a second wavelength, and at least one of the first wavelength and second wavelength comprises an infra-red wavelength.