It is quite possible to determine the location of a person by phone number. Including without the consent of the subscriber. This is pure truth. Now let's see how it works so that you can protect yourself from illegal surveillance. Other intentions can turn into problems with the law for you. And let's stop believing in fairy tales about wonderful websites and hacker programs where you can drive in a phone number and, oh, miracle, get instant results. This is not to us, but to the science fiction section of the district library
Direct access to the machine
You will greatly facilitate the task of an attacker by giving him direct access to the telephone set. Having taken possession of a cell phone for a short time (while you are sleeping or washing in the shower), the person who wants to follow you activates the service to determine the location of the subscriber. Each cellular operator has a different name for such services: Radar, Locator, Geopoisk and so on. But the bottom line is that the surveillance of the subscriber is carried out only with his personal consent. That is, a person must independently activate such a service from his device, to which an SMS will come with a request to confirm the connection of the option. However, instead of the owner of the SIM card, the one who has the cell phone can do it. A victim can detect surveillance only if he notices a suspicious spending of funds on the balance sheet or, for example,when he looks at the connected services in his personal account on the website of the mobile operator.
Forbidden fruit of "apple" gadgets
An attacker only needs to know the Apple ID and password. Then the corresponding application "Find IPhone" is downloaded and the location of the subscriber is monitored remotely. In this case, the tracking function must be configured on the phone or other gadget of the surveillance object. Although, as a rule, people try to somehow secure their device and connect such an option in case of theft. In this case, funds on the balance are not spent, traffic is practically not spent. However, the victim can simply change the password if any suspicions still arise.
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Spyware
According to the principle described in the "Direct access to the device" section, the attacker installs a special spyware program on the victim's phone. Such applications are even freely available. They are sold with the same proviso that a person voluntarily installs such a program on his device. Otherwise, it would be a criminal offense. Spy software can be different, which, in particular, allows you not only to find out where the subscriber is, but also to listen to telephone conversations and read SMS messages. These pranks are "treated" with an antivirus, and in special cases by a visit to the telephone service, where the operating system of the device will be reinstalled in the correct way.
Corruption again
We do not want to completely blacken the law enforcement system. Let's just say that the security forces have the broadest opportunities to determine the coordinates of the subscriber, which the SORM system provides them. Yes, that's right, the disclosure of the secret of communication is allowed only by a court decision. However, any material can be presented in such a way that the most meticulous Themis will get confused in the conclusions of the investigation. The chain of suspects can be very confusing, and therefore one of its many links is unlikely to arouse any suspicion. So make the right conclusions. Unfortunately, it is almost impossible to defend against such surveillance. Because the change of the telephone set and the SIM card purchased from the metro do not give any guarantee for the privacy of your telephone conversations.
Famous hackers
What is not attributed to the legendary hackers who easily hack the websites of government agencies, turn off the lights in entire neighborhoods and, it seems, are about to get to the command center for launching ballistic missiles. But in the case of phones, everything is much simpler and amenable to logic. The arsenal of tracking tools includes the notorious SS7 and its famous vulnerabilities. However, this kind of knowledge is possessed by a very narrow circle of specialists. Your sysadmin or familiar "computer guy" who put Windows for a bottle of beer is unlikely to be able to help. Yes, and all this is very expensive, and the risk of getting a criminal record remains the same as if you put a "prog" in the gadget of your passion, while she thoughtfully leafing through a magazine in the toilet.