You will need
- Internet access, a phone number that called
Find in the Internet the free services offered by the first seven digits defining the prefix of the mobile number. The prefix is the numbers tied to a specific mobile operator or to a particular region – region, region, country and even city. In such services it is important to enter the phone number into the search bar, the result you will receive instantly.
Contact your operator to request a printout of incoming calls or SMS messages. This printout can also see the region from which you called. If your city does not have an office operator, go to their official website or call the customer support center toll free phone number. Specify the region or city where the caller is constantly harassing you with phone calls and texts.
Find Internet directories that contain cell phone numbers of specific operators and regions. Perhaps that is in them through search it is possible to calculate the location of the subscriber you are interested in.
Enter in a search engine query specifying the phone number that you are interested in. Among all results of the query, surely, you will find the definition of the operator and the subscriber. Don't worry if you could not find the information you need in one search. Try typing the same query on other popular search engines.
Contact specialized organizations that for a fee will find the caller. All search activities they will do on their own, and you will be given information on the whereabouts of the person who is calling you.
If the calls and sms messages from unknown numbers come with threats or blackmail, you must contact the police. There will not only find a subscriber that violate your rights, but punish him according to the law.