How to find the proof of action track during the epidemic?

During the current epidemic, many employees returned to their workplaces to prepare for their return to work. Local authorities (administrative committees, industrial parks, streets, etc. ) Require the enterprises returning to work to provide the corresponding prevention and control plan for the epidemic situation of returning to work, involving employee health information forms and personal trajectories (their mobile phone roaming information). Therefore, the three major operators, China Telecom, China Mobile and China Unicom, jointly launched the roaming query service.