Why can the itinerary code still find you even if your phone is turned off? The reason is this!

The travel code is open! "

"Health code is open!"

You should be familiar with these two sentences! Since the outbreak of the COVID-19 pandemic, these two codes on our mobile phones have been "accompanying" us. They are very important tools for epidemic prevention and control, and can effectively record the movement trajectory of each of us. Have you ever thought about whether the itinerary code can find you if you remove the SIM card?

The travel code is a communication big data travel card launched by the China Academy of Information and Communications Technology and the three major operators. It can use the base station location of the mobile phone to receive data and provide query services for mobile phone users across the country. It can query the information of cities and counties visited within 14 days. It can determine whether the mobile phone user has passed through high-risk areas and whether corresponding epidemic prevention measures need to be taken.

The health code was first issued in Hangzhou, Zhejiang. It is based on actual data and is a personal QR code generated by citizens after they register their personal health information online. The introduction of the health code will make the resumption of work and production in the entire society more accurate, scientific and orderly.

So if you remove the SIM card, can the itinerary code be used to find you?

The answer is yes. The trip code can track all your movements throughout the journey, and it will be useless even if you remove the SIM card or turn off the phone.

Then why can the itinerary code still find you even if you remove the SIM card?

This is from the base station. In our daily life, we often see tall and sharp towers with mobile logos on the road. This is the base station. The base station can send and receive messages through the antenna, which can ensure that our mobile devices can connect to the signal anytime and anywhere, and ensure the network and call functions of the mobile phone. Our mobile phones receive signals through base stations. Its passive skill is to constantly look for base stations to exchange positions. Even if you set your phone to flight mode or disconnect from the network, or even unplug the SIM card, the phone is still interacting with the base station.

Moreover, it is common sense that if you encounter an emergency, even if your phone does not have a SIM card, as long as there is a signal, you can still call 110 or other telephone numbers for help. Of course, if you have an Android phone, the base station will not be able to find you after the phone is completely powered off, but Apple phones have a built-in ultra-low power chip that will keep the phone online forever, so it can still be located. If you really want to prevent being tracked, you can only completely remove the battery or destroy the phone to do so.

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