What if run-length encoding can't find the itinerary data?

If it is found that travel itinerary can't be washed off, it is suggested to check whether the distance from 20 o'clock is more than 4 hours at the first time. If it exceeds, call someone immediately (anyone can roam freely), preferably for more than 3 minutes. If not, try again the next day. It is best to have five calls on 1 day, with an interval of 1 hour or 1.5 hours. The interval between the first call and the last call was more than 4 hours until 20 o'clock that day.

Access to big data card provides location query service according to the signaling data of user's mobile phone, which has little to do with Bluetooth location information in essence, that is, mobile phone operators can query the places they have been in where there is a signal, but in some areas, if the signal value of mobile phone is weak or there is no signal, there will be deviation and the places they have been may appear.

Extended data:

Precautions:

In order to facilitate users to inquire and prove the health status of epidemic prevention, the national comprehensive government service platform has now incorporated communication big data travel card information into the epidemic prevention health information code service.

In the code for inquiring epidemic prevention health information in domestic and overseas travel declaration on 14, after users declare the domestic cities and overseas countries (regions) that they have visited in the past 14, the system will check the declaration information with the travel card data of communication big data to avoid false positives and false negatives.

People's Daily Online-Ministry of Industry and Information Technology responded to the "Epidemic Prevention and Control Trip Inquiry" service.

People's Network-How to check and prove my 14-day trip? The Ministry of Industry and Information Technology promotes online services.