Unplug the SIM card, turn it off, use a non-smart phone, and travel itinerary code won't know your whereabouts?

Because of the epidemic, everyone should try to avoid these epidemic places when traveling, otherwise the travel code will be marked or discolored. Will the mobile phone card display the boarding code when it is pulled out? I believe many people are not very clear about some rules of the travel code. Is the change of travel code related to the mobile phone card? Will the mobile phone card change when it is unplugged? Let's take a look at the relevant introduction.

Whether you unplug the SIM card or turn it off, or use a non-smart phone, as long as you carry it with you, operators can use magical big data to find out your action track in a short time. From this perspective, the operator is always by your side, and all your trips are clear at a glance.

How powerful is big data?

You may also have doubts. When you watch something on your mobile phone, and then open the shopping APP, these apps will give priority to what you have just seen.

For another example, if you stay in a food video, then you will continue to recommend relevant videos to you.

This is the application of big data, based on the detection and analysis of your behavior habits by app, in order to better cater to you.

In fact, the "precise positioning" of operators' big data is more advanced.

It can distinguish users, capture the information of websites or apps we have visited, and even know how much traffic is consumed.

At the same time, our daily calls, information exchange, call duration, terminal preferences and consumption data can all be obtained by operators.

After capturing these data, operators can analyze your age, gender, marital status, location, mobile phone brand and other information, which shows that people in big data have "no privacy".

How does travel itinerary Code know where you are going?

1, base station positioning

Base station, abbreviated as BS, refers to public mobile communication base station. As the name implies, the base station provides signals to the mobile phone. As long as our mobile phone has a signal, the base station is always around us like air.

We can also see that the signal strength of mobile phones is different in different occasions, because the radiation distance of base stations is fixed. Usually, the cell phone signal is the best base station to access the surrounding signals.

At present, the base stations built by the three major operators basically cover the whole country. When we move with our mobile phones, the access base stations will also change constantly, just like the B base station with strong signal and the A base station with weak signal.

In any case, the two base stations A and B will analyze the received cell phone signal parameters, and then determine the location of the cell phone through a series of professional codes.

Base station is the most basic and important way to locate mobile phones. Travel code (communication big data travel card) knows where you have been, mainly because of its credit.

2. Wireless network positioning

Our common wireless router is equivalent to a scaled-down base station, and each router has a unique MAC address. When the mobile phone is successfully connected, the location information of the mobile phone will be fed back to the router terminal system.

For example, you always feel that your wireless network is slow. You can ask professionals to help you analyze the data, and you can find out who is stealing your Wi-Fi, and you can blacklist him from the terminal. After that, he can't connect to your Wi-Fi.

3.GPS positioning

Mobile phones generally have location information service functions, such as maps, location information and navigation functions. These are all connected to the satellite navigation system in the sky. As long as the satellites in the sky are still there, it is bound to leave position information.

Both the base station and wireless positioning are to find out your range, and there is a certain position deviation, while GPS positioning is very accurate, and the error will not exceed 15 meters. When I was a child, watching TV with satellite stove search signals belonged to GPS positioning.

4. Built-in positioning

A person bought two mobile phones of the same model, thinking they were exactly the same, but they were actually different, just like twins. They all have their own ID cards. Moreover, every mobile phone is given an "ID card" when it leaves the factory.

This is the IMEI number of the mobile phone. The identification code is mainly composed of IMEI, MEID or S/N, which can be accurately distinguished. Can be detected by the base station, after the data analysis of the base station, you can form your action trajectory.

Interested friends can try it, and you can see the unique identification code of your mobile phone by typing it with the dialing key of your mobile phone.

From this point of view, even if the SIM card is unplugged or turned off, it only evades base station signal positioning, wireless network positioning and GPS positioning. After some efforts, professionals can still use the professional code of the base station to find the IMEI number of your mobile phone, and then describe your action track.

Under what circumstances will the trip code not be recorded?

1. The newly opened account did not exceed 14 days.

According to the epidemic characteristics, the data collected by the travel code is the data of the past 14 days. Therefore, mobile phone users who have newly opened an account for less than 14 days will not generate any records on the trip code because they cannot collect the complete data of 14 days. Of course, we'll have it another day.

2. Don't stay in one place for more than 4 hours.

For example, I obviously took the bus from Nanjing to Maanshan, but I didn't record it. This is because when the trip code records my whereabouts, I need to trigger the condition of staying for 4 hours.

For another example, I flew to Chengdu at eight o'clock in the morning, took the high-speed train to Chongqing at nine o'clock, and then stayed in Chongqing for a day. At this time, Chengdu, which only stayed for 1 hour, will not be recorded in the travel itinerary code, but only Chongqing.

If I only go to the edge of Chongqing and the base station uses Chengdu, then the trip code will only record Chengdu, not Chongqing.

3. Theoretically, users can avoid being tracked by unplugging the battery and taking out the SIM card at the same time. For some all-in-one machines that can't remove the battery, they may be tracked even if they are turned off. Simply unplugging the SIM card will only increase the difficulty of being tracked.

From the moment the mobile phone card is inserted into the mobile phone, the mobile phone will be connected to the signal acquisition network of the base station by default, so that the base station can obtain the ID information of the mobile phone, so that even if the card is pulled out, the base station will judge whether there is a SIM card when it is turned on.

Whether the user can still see the exact location after turning off the phone is actually achievable in theory, but it is not easy to achieve in practice. After the user turns off the phone, the base station signal connected to the mobile phone can actually see the location of the mobile phone at that time.

The safest way is to remove the battery of the mobile phone, which is equivalent to cutting off contact with the outside world when the mobile phone has no power supply. However, because most mobile phone batteries on the market are non-detachable, it is quite inconvenient to operate.

Under what circumstances will the trip code be recorded with deviation?

The travel code mainly depends on the mobile phone. If the signal base station can't cover it, the owner's own defects and other reasons may also cause the boarding code to deviate.

1, the stay time is less than 4 hours but it is recorded.

Just like the improved Chongqing edge above, Chengdu is recorded. Who told you that the base station signal in Chengdu is stronger than that in Chongqing? In the case of cross coverage of base stations, the mobile phone will receive the base station with strong signal.

China people record that they have been abroad.

Tigers sometimes take a nap, not to mention operators facing more than one billion customers.

According to the data, by the end of February, 202 1 and 65438+,the number of mobile phone users in China exceeded1600 million, and every household could access the boarding code. Under such a huge data analysis, the operator's server will also have sporadic failures.

When the base station data is confused, the wrong trip code may be sent. For example, when people are in Yunnan, the word Vietnam appears on the itinerary code. This phenomenon is mostly caused by the temporary failure of base station signal and operator system.

People have never been to high-risk areas, but the travel code is marked with an asterisk.

After all, travel itinerary code can only be located in one municipality. For example, I have only been to Leshan within 14 days, but I have never been to Emei Mountain (Emei Mountain belongs to the county-level city and is under the jurisdiction of Leshan City). If Emei Mountain belongs to the middle and high risk area, a * sign will appear behind Leshan City in travel itinerary code.

Leshan is about 36.8 kilometers away from Emei Mountain. The epidemic can't spread so far, and I can't be isolated. As long as I report it truthfully, the asterisk will disappear when Emei Mountain is reduced to a low-risk area.

Or if I leave Leshan for Chengdu, 14 days later, the asterisk on the travel itinerary code disappears.

If the "asterisk" on the travel itinerary code still exists after 14 days, I can also call the corresponding communication service provider of my mobile phone to make adjustments.

How do people without smart phones know the travel itinerary code?

If it is not a smart phone, you can send a short message "CXMYD# 4 digits after my ID card" to the operator for inquiry (sending object: Telecom 1000 1, Mobile 10086, Unicom 100 10).

If this machine is not for personal ID card processing (one master and many cards), but for its own use, you can send "CXMYD# this machine corresponds to the last 4 digits of valid registration certificate" for inquiry.

From this perspective, even if you use a non-smart phone, as long as you carry it with you, operators can use magical big data to find out your action track in a short time.

Of course, the old man-machine is also very advanced now. One is an old man-machine that uses GPS positioning and network positioning. The other is the elderly button, which is generally located by the base station. If you meet a master programmer, you can easily bring up the action track.

In fact, with the deepening of epidemic prevention work, it has supported the application and inquiry of health codes on behalf of others.

If the elderly over 60 years old or children under 16 travel alone, you can ask passers-by to help you inquire. Passers-by can display the health code of 10 second simply by inputting the ID number of the elderly or children on the relevant page of "Epidemic Prevention Health Information Code" on Alipay.

In addition, some cities and regions also support swiping ID cards (such as Zhejiang) and citizen cards (such as Hangzhou) on some reading devices for inquiry.