This paper analyzes the viability of the use of employees' smartphones following the BYOD paradigm as a valid tool for companies in order to conduct presence control (primarily for remote workforce). A Mobile Information System is also proposed for Presence Control using exclusively terminal-based reactive location technologies, meeting cost minimization and universal access criteria. Qualitative and quantitative references are proposed, adequate to the location information accuracy demanded in different business remote workforce control scenarios, and taking into consideration the strictest international regulation in force relevant to the location of individuals in Emergency Systems, promoted by the North American FCC. A prototype for the proposed Information System was developed to evaluate its validity under different real world conditions, and valuable information was obtained on the accuracy and precision of location data using real devices (iOS and Android) under heterogeneous connectivity conditions and workplace premises.