Who sent the text message about the epidemic situation in Dongying city?

Big data epidemic SMS is sent according to the mobile phone number. The COVID-19 Epidemic Prevention and Control Command was informed that sending big data epidemic information according to the mobile phone number is a spatio-temporal phenomenon. According to the relevant person in charge, the city is currently carrying out further flow adjustment work, using big data, internet plus and other technical means to screen relevant personnel. For example, if a citizen's phone number and the number of confirmed cases stay in the same time-space grid (with a range of 800 m× 800 m) for a period of time, they will receive an epidemic prevention and control reminder message.