Why can a mobile phone be located even after it is turned off? How many secrets do you know about these mobile phones?

Checking on someone? Looking for someone due to a debt dispute? Or even mortgaging a vehicle, people usually use positioning methods to lock on to the target, and the most common method is mobile phone positioning. In order to avoid being maliciously tracked, what can we do?

First, let's understand what is the difference between locating a mobile phone when it is turned on and turned off?

When powered on, the phone will send two-way positioning information to surrounding base stations at a frequency of milliseconds. If criminals want to obtain the location of the phone, it will not be difficult.

When the phone is turned off, it will send a signal to the base station, telling it to turn off. Normally, if you call this phone, you will be prompted that the user you are calling is turned off. If the phone is physically damaged, you will be prompted that the user you are calling is out of service.

So, will it not be located after turning off the phone? The answer is no.

If you use an Apple phone, you may not know that the NSA can continue to track the target phone after it is turned off. This is because the NSA implants a special Trojan software into the target phone in advance to provide an interface for future positioning. This is really terrifying.

There is another situation, that is, if the SIM card is removed, the location cannot be tracked, right? Not at all. Even if the SIM card is gone, you can still find out where the phone has been turned on by investigating the phone ID associated with the number, thereby tracking the geographic location information.

So how can we avoid being located? There are two ways. The first, and the safest way, is to remove the battery or physically destroy it, but this is too costly for the phone, right? It is even more expensive for the wallet. The second way is to interfere with the signal, wrap it with several layers of tin foil, or put it in an iron box? Of course, you can also refer to Snowden's method and put the phone in the refrigerator, haha~