A system of mobile devices, smartwatches, wearable devices, beacon devices and implemented method that make use of embedded network connection module capable of short distance connection range and low power consumption, and invented concepts of virtual service channel, virtual band, virtual user group and virtual poster, to create proximity based ad hoc inter-device communication systems such as building real-time inter-resident communication system, media information display-broadcasting system, remote emergency help request activation system, indoor short message communication system, mobile poster slideshow display stand system, object monitoring system, virtual device searching system, virtual coupon based marketing system, virtual media source exchange system, object activity alert system and waiting list registration system.