A device comprising a camera for capturing an image and a proximity sensor for proximity sensing, wherein the device is a mobile phone or tablet wherein the device is for optical wireless communication with a further device, wherein the camera comprises: an image sensor wherein the image sensor comprises: an array of sensor elements comprising image sensor elements for generating electrical image signals in response to received light and communication sensor elements for generating electrical communication signals in response to received light; a processing resource; and image signal conditioning circuitry configured to collect the generated electrical image signals from the image sensor elements and condition the generated image signals into a form suitable for the processing resource, wherein conditioning the electrical image signals comprises converting the image signals into digital image signals for the processing resource and communication signal conditioning circuitry configured to collect the generated electrical communication signals from the communication sensor elements and condition the electrical communication signals into a form suitable for the processing resource, wherein conditioning the electrical communication signals comprises converting the electrical communication signals into digital communication signals for the processing resource; wherein the processing resource is configured to process the conditioned image signals and digital communication signals to obtain image data and incoming optical wireless communication data respectively, wherein the image data are suitable for constructing a digital representation of the image captured by the camera and wherein obtaining the incoming optical wireless communication data comprises performing a demodulation process on the digital communication signals to obtain said incoming optical wireless communication data that has been encoded, in accordance with a modulation scheme, in an optical wireless communication signal that forms at least part of said received light and wherein said demodulation process is performed in accordance with said modulation scheme; wherein the proximity sensor is configured to sense proximity of a nearby object using optical signals and further configured for optical wireless communication, wherein the proximity sensor comprises: an emitter configured to produce an outgoing optical signal; a receiver configured to receive an incoming optical signal; and a proximity processing resource; wherein the emitter is configured to emit an outgoing optical wireless communication signal, wherein the proximity processing resource is configured to perform a modulation process to encode outgoing optical wireless communication data on at least part of the outgoing optical wireless communication signal in accordance with a modulation scheme. an image sensor wherein the image sensor comprises: an array of sensor elements comprising image sensor elements for generating electrical image signals in response to received light and communication sensor elements for generating electrical communication signals in response to received light; a processing resource; and image signal conditioning circuitry configured to collect the generated electrical image signals from the image sensor elements and condition the generated image signals into a form suitable for the processing resource, wherein conditioning the electrical image signals comprises converting the image signals into digital image signals for the processing resource and communication signal conditioning circuitry configured to collect the generated electrical communication signals from the communication sensor elements and condition the electrical communication signals into a form suitable for the processing resource, wherein conditioning the electrical communication signals comprises converting the electrical communication signals into digital communication signals for the processing resource; wherein the processing resource is configured to process the conditioned image signals and digital communication signals to obtain image data and incoming optical wireless communication data respectively, wherein the image data are suitable for constructing a digital representation of the image captured by the camera and wherein obtaining the incoming optical wireless communication data comprises performing a demodulation process on the digital communication signals to obtain said incoming optical wireless communication data that has been encoded, in accordance with a modulation scheme, in an optical wireless communication signal that forms at least part of said received light and wherein said demodulation process is performed in accordance with said modulation scheme; wherein the proximity sensor is configured to sense proximity of a nearby object using optical signals and further configured for optical wireless communication, wherein the proximity sensor comprises: an emitter configured to produce an outgoing optical signal; a receiver configured to receive an incoming optical signal; and a proximity processing resource; an emitter configured to produce an outgoing optical signal; a receiver configured to receive an incoming optical signal; and a proximity processing resource; wherein the emitter is configured to emit an outgoing optical wireless communication signal, wherein the proximity processing resource is configured to perform a modulation process to encode outgoing optical wireless communication data on at least part of the outgoing optical wireless communication signal in accordance with a modulation scheme.