Who can benefit from the Mobile Search Engine? Anyone who needs to know the name and address of a particular phone number (either wire or cell). These services are basically irreplaceable if you can not find this information for free, for example by using directories or major search engines (Google, Yahoo).
Special Reverse Search Services offer you the opportunity to purchase this information. They buy access to databases of phone companies and mobile operators and create their own huge database with most US phone numbers, including unlisted wired and mobile numbers. Most services are subject to agreements prohibiting them from providing this information for free. This is because of data protection reasons that these services are not used for illegal purposes. Telephone companies charge a fee for accessing these services. If you want to subscribe to one and start using it, you'll need to provide your credit card or PayPal. You can usually subscribe for a fixed period of time, for example, monthly or annually.
Information about the owner of the phone number includes the owner's address, name, and some additional information (ie, member of the household). To get this information, you just need to subscribe to a mobile reverse search service and enter the number in question into their form. Even without signing up, you may have free information, such as whether this phone number is mobile or landline, the city and the state where this number is registered, and if more information is available.