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Understand how Spy Dialer works. Open Spy Dialer. Click the search bar. Enter a phone number. Click Search. Click Search when prompted. Review the results.
Spy Dialer is a free service which searches old phone records and available online information. While Spy Dialer is free, it is also relatively out-of-date; this means that you may find the old owner of the phone rather than the current one. As with any phone number, you won't find any information about the person if they've requested that their number be removed from common databases. Go to https://www.spydialer.com/ in your computer's web browser. It's in the middle of the page. Type in the 10-digit phone number that you want to look up. It's a blue button below the search bar. Doing so will prompt Spy Dialer to begin processing the phone number. This blue button will appear in the middle of the page once Spy Dialer finishes displaying an ad. If you use an ad blocker, you won't see the ad; instead, you'll just wait for a few seconds. If the owner hasn't requested that their phone number be removed, you should see a name and an approximate location (e.g., "near San Jose, CA"). Again, the name that you see here may be incorrect. You can try to get the correct name by running the same search a few more times.