We can check the health code at the same time we can also check the big data communication itinerary card. We are all familiar with this big data communication card, which plays an important role in preventing and controlling the spread of the epidemic, providing users with the service of "querying the track of action" in order to quickly lock the source of infection and close contacts.

This feature works in conjunction with the China Institute of Information Technology and the three major telecom operators, China Telecom, China Mobile, and China Unicom, to obtain user location information through "mobile positioning".

So guess what, turn off your phone, pull out your SIM card, and you'll still be able to find out where you're going with Big Data Itinerary Card?

Here's what we know about how cell phones are positioned. "The first thing you need to know is what you're looking for, and how you're going to get it.

The phone automatically searches for nearby cell sites, selects the one with the strongest signal to connect to, and automatically switches sites as the phone's location changes.

And the positioning technology is based on the signal parameters of the base station your phone is connected to, such as signal arrival time, azimuth, strength, and so on, to determine the location of the phone.

Each wifi router has a globally unique MAC address, and when your phone is connected to wifi, its wifi antenna will detect relevant data around it and provide it to a dedicated location service provider, so that you can determine your phone's location.

In daily life, we often need to realize navigation and positioning functions through satellite positioning.

Satellites are constantly transmitting navigation message signals to the ground in space, and by using the distance, angle, and other data between your phone and each satellite, you can accurately project the location of your phone.

There is an IMEI code inside the phone, which is recognized by the base station regardless of whether your phone is powered on or not, and whether or not the card is plugged in, making it easy to locate the phone's position.

Browsing here, I believe we have an answer in mind. Most of the positioning needs to be turned on and connected to the network, but like the last fourth case, as long as you have your phone with you can be located, regardless of whether it is turned on or not, plug in the card.

Unless you remove your phone's battery and SIM card, your location can be accessed in minutes.

But then again, like most phones nowadays, they are all-in-one units with non-removable batteries, and cell phones have become so much a part of our lives that it's inconvenient to travel without them.

Finally, although in the era of big data, we have nothing to hide, but partners do not have to worry about the trip card will leak privacy, because the state also has a more stringent protection mechanism to prevent these information from being stolen by others ~

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