Telefonica's research and development unit is currently developing a mobile phone that enables users to send SMS, as well as make and receive voice calls in areas without mobile network coverage. Mobile communication is made possible via an application installed on the mobile device. All mobile phone owners using this application form a network in which their phones would serve as signal repeaters, El Mundo reports. The connectivity application would establish direct wireless data connections between two mobile devices that are relatively close to each other. The devices would form a network in which two phones that are 100 meters away from each other could share data and voice calls without requiring coverage.