During the epidemic, many people traveling need to show the trip card, through the relevant information to track personal trip track, this is a great help to the epidemic prevention and control, but this must be in the case of normal use of the phone. If the phone is turned off, you may not be able to check the track of the trip code, but will be through other ways, such as social information and other rows of personal travel.

Can a cell phone turned off still be monitored by big data

Not necessarily.

During an outbreak, the main way big data screening is based on cell phone signals, so if a phone is turned off, it may not be found, but it may be found in other ways, such as social messaging, nearby communities, marketers, and so on; or to confirm project information.

Therefore, when you go out every day, be careful not to turn off your cell phone so as not to record the location of the travel code, because troubleshooting is not only based on cell phone signals; if there is a risk exposure, it should be reported in the first time and actively cooperate with the implementation of the appropriate isolation measures.

Can a cell phone shutdown locate the track of a trip code

A cell phone shutdown cannot locate the track of a trip.

The principle of cell phone positioning is to determine the location of the phone by measuring the distance between the phone and the base station. The accuracy of this positioning method depends on the distribution and coverage of the base station. The "Comms Big Data Travel Card" is green, which means that it has not traveled to or through a high-risk area in 14 days.

The "Comms Trip Card" acquires cellular signaling data from the location of the base station where the user's phone is located. The collection, transmission, and processing of signaling data is fully automated, and there are strict security and privacy protection mechanisms in place to fully protect the user's privacy.

The principle of cell phone positioning is to determine the location of the cell phone by measuring the distance between the cell phone and the base station. The accuracy of this positioning method depends largely on the distribution of base stations and the size of the coverage area. The more base stations around, the higher the accuracy of the positioning effect. The positioning method based on the GPS module is to send its own position signal to the positioning background (usually satellites) through the GPS module on the phone to realize the positioning of the phone.

With the widespread popularity of navigation and mapping software, a built-in GPS module has become a necessary feature of all smartphones. Users can choose to turn it on or off.

When the user turns off the phone normally, a message is automatically sent to the base station, which is equivalent to notifying the base station of the network shutdown status. If the phone is turned off normally, the message that other people hear when they call is "The user you are calling is turned off". If you unplug the battery, because the base station doesn't receive the shutdown notification message, it will still be online by default, but without a signal, and the prompts that other people hear will be "your user is out of service".

How big data finds out about a person's trajectory

This is the digital age. Cell phones can be said to be carried by people for a long time. Therefore, the mobile trajectory of cell phones also effectively represents people's whereabouts. Our cell phones, whether they are smartphones or traditional feature phones, as long as they are plugged into a cell phone card, from power on to power off, they will keep in touch with the network base stations of China Mobile, Telecom or China Unicom. That doesn't mean you only communicate with the base station when you make a call.

This temporal connection is technically called signaling exchange. Carriers have clear locations where their base stations are built, such as upstairs in a neighborhood. Based on the communication link between your phone and the base station, you can roughly determine which neighborhood you appear in. Typically, it's within 300 meters in urban areas and 500 meters in rural areas. This could be the principle behind the communications big data travel card service that operators are launching this year.

Other sources of whereabouts data can be more broadly included in your connection with public **** facilities, such as the use of public **** transportation, and systematically record the entry and exit of high-speed rail tickets. buses, subway stations, highway entrances and exits, etc. It can be said that in the digital and intelligent era, a person's whereabouts can be tracked.