A telephone number can be traced through various means. If the number has been entered somewhere on the Web, such as a blog or public job profile, a quick search through a search engine can help trace the number.
Some social-networking sites allow a person to search for someone through entering personal information such as a username, an address or a phone number. Some states like California and Alaska allow call tracing within a local service area by entering a code on the phone. Just enter the code provided by the phone company immediately after the call to trace the phone number.