Whether you unplug the SIM card or shut down, or use a non-smart phone, as long as you carry your phone with you, operators can use the vast amount of big data to find out your mobile trajectory in a short period of time. From this point of view, the operator is like a shadow, all your itineraries, it is clear at a glance.
How powerful is big data?
You may also have wondered, when you use your mobile phone to see something, change hands and then open the shopping APP, these apps will give priority to recommending what you just saw.
For example, if you have stopped at a food video, you will continue to recommend the relevant video to you.
This is the use of big data, which is based on the APP to detect and analyze your behavior habits in order to better cater to you.
In fact, the "precise positioning" of operators' big data is more advanced.
It can differentiate users, crawl the information of the websites or apps we have visited, and even know how much traffic is consumed.
At the same time, our daily calls, information exchanges, the length of the call, terminal preferences and consumption data and other information can be obtained by operators.
After the operator crawls this data, it can analyze your age, gender, marriage, location, mobile phone brand and other information, which shows that people have "no privacy" under big data.
What does the itinerary code rely on to know your whereabouts? 1. Base station positioning
Base station, referred to as BS, specifically refers to the public mobile communication base station, as the name suggests, the base station is to provide a signal to the mobile phone, as long as our mobile phone has a signal, the base station is like air, always filling around us.
We can also see that in different occasions, the signal strength of the mobile phone is not the same, which is the reason for the fixed radiation distance of the base station, usually, the mobile phone signal is the base station with the optimal access to the surrounding signal.
At present, the base stations built by the three major operators basically cover the whole country, and when we move with mobile phones, the access base stations will continue to change, just like the B base stations with super signals, robbing the A base station business with weak signals.
In any case, the two base stations A and B will receive the mobile phone signal parameters, and then through a series of professional code analysis, you can determine the location of the mobile phone.
The base station is the most basic and most important way to locate the mobile phone, and the itinerary code (communication big data itinerary card) knows where you have been, mainly due to its credit.
2. Wireless network positioning
Our commonly used wireless router is equivalent to a scaled-down version of the 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, if you always feel that your wireless network is slow, you can ask a professional to help you analyze the data, you can find out who is stealing your Wi-Fi, and can pull him into the blacklist from the terminal, after that, he can no longer connect to your Wi-Fi.
3. GPS positioning
Mobile phones generally have location information service functions, such as maps, location information, navigation functions, etc. These are all connected to the satellite navigation system in the sky, as long as the satellites in the sky are still there, they will inevitably leave position information.
Base station and wireless positioning is to find out the range you are in, there is a certain position deviation, and GPS positioning is very accurate, the error will not exceed 15 meters. When I was a child, I used a satellite pot to search for signals to watch TV, which belonged to GPS positioning.
4. Built-in positioning
One person bought two mobile phones of the same model, thinking that they were exactly the same, but in fact, they were different, just like twins, they both had their own ID cards. And each mobile phone is also given an "identity card" when it leaves the factory.
This is the mobile phone's IMEI number identification code, the identification code is mainly composed of IMEI, MEID or S/N, to achieve accurate differentiation, it can be detected by the base station, after the data analysis of the base station, you can form your action trajectory.
Interested partners can try, use the mobile phone dial key input, you can see their mobile phone unique identification code.
From this point of view, even if you unplug the SIM card or shut down, but just escaped the base station signal positioning, wireless network positioning and GPS positioning, under a lot of effort, professionals can still use the base station professional code, find the IMEI number identification code of your mobile phone, and then depict your action trajectory.
When does the trip code not generate a record?
1. The newly opened user has not exceeded 14 days
Combined with the characteristics of the epidemic, the data collected by the itinerary code is the data of the past 14 days, so mobile phone users who have opened a new account for less than 14 days will not have any records on the itinerary code because they cannot collect the complete 14-day data. Of course, wait another day.
2. Have not stayed in an area for more than 4 hours
For example, I obviously took a bus from Nanjing to Ma'anshan, but there is no record, which is due to the fact that when the itinerary code records the whereabouts, it needs to trigger the condition of staying for 4 hours.
For another example, once at 8 o'clock in the morning I flew to Chengdu, and at 9 o'clock I took the high-speed train to Chongqing, and then stayed in Chongqing for a day, at this time, the itinerary code will not record Chengdu that has only stayed for 1 hour, but only Chongqing.
If I just go to the edge of Chongqing and the base station is chengdu, then the itinerary code will only record Chengdu, not Chongqing.
3, theoretically speaking, the user unplugs the battery, while removing the SIM card to avoid being tracked, for some can not remove the battery of the all-in-one machine, even if the shutdown is also the possibility of being tracked, simply unplugging the SIM card will only increase the difficulty of being tracked.
From the moment the mobile phone card is inserted on the mobile phone, the mobile phone defaults to connect to the base station signal acquisition network, so that the base station obtains the ID information of the mobile phone, so that even if the card is unplugged, but booted, the base station will judge whether there is a SIM card.
For the user after shutting down, whether it can still see the exact location, in fact, this can indeed be achieved in theory, but in actual operation, it can not be easily done, after the user shuts down, the base station signal connected to the mobile phone is actually able to view the location of the mobile phone at that time.
The most secure way is to cut off the mobile phone battery, in the case of no power supply to the mobile phone, equivalent to cutting off contact with the outside world, but in view of the fact that the vast majority of mobile phone batteries on the market are non-removable, therefore, the operation is quite inconvenient.
Under what circumstances does the itinerary code have a recording deviation?
The itinerary code mainly relies on mobile phones, and if the signal base station is not covered, the owner's own defects and other reasons may also cause deviations in the travel code.
1. It has not stayed for more than 4 hours but has been recorded
Just like the edge of Chongqing raised above, but the record is the same as Chengdu, who called Chengdu's base station signal stronger than Chongqing's! In the case of crossover of base stations, the mobile phone will receive a base station with a strong signal.
2, people in china, but record that they have been abroad
Tigers also have a time to nap, not to mention operators facing more than a billion customers.
According to the data, as of December 2021, there are more than 1.6 billion mobile phone users in the mainland, and each household may have access to the itinerary code, and under such a huge data analysis, the operator's server will also have sporadic failures.
When the base station data is disordered, the wrong itinerary code can be transmitted, such as people in Yunnan, but the word Vietnam appears on the itinerary code. Most of this phenomenon is caused by temporary failures in base station signals and operator systems.
3, people have not been to the medium and high-risk areas, but the itinerary code has an asterisk
After all, the itinerary code can only be located to the municipal city, for example, I have only been to Leshan City in 14 days, and have not been to Emeishan City (Emeishan City belongs to the county-level city and is under the jurisdiction of Leshan City), if Emeishan City belongs to the medium and high-risk area, then the "*" sign will appear behind Leshan City on the itinerary code.
Leshan is about 36.8 kilometers away from Mount Emei, the epidemic cannot spread so far, I can not be isolated, as long as it is reported truthfully, when Emeishan City is reduced to a low-risk area, the asterisk will disappear on its own.
Or if I leave Leshan for Chengdu, after 14 days, the asterisk on the itinerary code will also disappear.
If the "asterisk" on the itinerary code still exists after 14 days, I can also call the corresponding communication service provider on my mobile phone to adjust it.
How do people who don't have a smartphone know their itinerary code?
If it is not a smartphone, you can send a text message "CXMYD# after my ID card 4 digits" to the affiliated operator for inquiry (sending object: Telecom 10001, Mobile 10086, Unicom 10010).
If this machine is not handled by a personal ID card (one main card and multiple secondary cards), but you are using it yourself, you can send "CXMYD# local correspondence valid registration certificate after 4 digits" to inquire.
From this point of view, even if you are using a non-smart phone, as long as you carry your mobile phone with you, operators can use the magic of big data to find out your action trajectory in a short period of time.
Of course, now the elderly machine is also very advanced, one is the elderly smart machine, using GPS positioning and network positioning. The other is the elderly button machine, which generally uses base station positioning, and if you encounter a program master, you can easily call up the action trajectory.
In fact, with the deepening of epidemic prevention work, we have supported the application and inquiry of health codes on behalf of others.
For example, if the elderly over 60 years old or children under 16 years old travel alone, they can ask passers-by to help inquire, and passers-by only need to enter the ID number of the elderly or children on the relevant page of the "epidemic prevention health information code" on Alipay, and the health code can be displayed for 10 seconds.
In addition, some cities and regions also support swiping ID cards (such as Zhejiang) and citizen cards (such as Hangzhou) on some reading devices to inquire.