You will need
  • - the directory;
  • - access to the Internet.
If you learned that a cell phone subscriber has changed, refer to the serving network operator for his new contacts. Please note that the provision of such information occurs only in a strictly specified rules of the company cases, therefore, it is possible that you will deny your request. Also, if your request is approved and conditions considered acceptable to inform you about the changed room phone, the disadvantage of this method is that you are interested in people could use the services of another operator when you connect a new room mobile phone.
In this case, you will have to go to other companies for obtaining data about the caller, you also may not provide depending on the rules of the operator. Also note that you need to know the exact passport data of interest to you.
View pages in social networks you are interested subscriber, it is possible that his new number of the phone listed in the contact information. Also having contacts on the Internet, you can ask him about the new number directly. You can also send him a message by email or contact one of the people in his friends list. The Internet here provides far more opportunities.
If you want to know the changed landline phone, having information only about the old contact, call the help Desk supports you phone company, which you can find on its official website. Inform the employee of the available data and try to figure out the name and surname of the subscriber. Also having other information about the user, use if you have access to the Internet database resource