Article Tracking Possible COVID-19 Infection And Epidemic Outbreak Areas describes hipotetical scenario about position of infectious mobile phone user, using PhoneLog software for analyzing call detail records (CDR) and BTS tracker – hardware device designed for scaning radio signal of cell tower in an area of interest. Evidence about movement of infectious mobile phone user in that way represent hard fact which cannot be denied. BTS tracker device gives us real knowledge about coverage of some cell towers in environment since declarative coverage often doesn’t fit with real coverage. Identifying real coverage gives us the true picture of infectious user movements. If we cannot know real coverage of cell tower than movement of infectious mobile phone user is just an assumption.