How to Look Up an Unknown Phone Number Before Calling Back

Getting a call from a number you do not recognize is frustrating. You do not know whether it is a scam, a robocall, a local business trying to reach you, or something important. Calling back an unknown number can expose you to scammers who record your voice saying "yes" (used to authorize fraudulent charges) or who confirm your number is active and target you with more calls.

A reverse phone lookup is a search that tells you information about a phone number — the owner's name, the location it is registered to, whether it has been reported as spam, and sometimes the company name.

Several free tools exist for this. Google itself is the easiest starting point — type the phone number into Google's search bar and you will often see the business name or spam reports. The FTC's Do Not Call registry does not do lookups, but sites like Nomorobo, RoboKiller's online lookup, and the phone carrier's own spam database can help.

For landlines and business numbers, reverse lookups are more reliable. Cell phone lookups are less precise because cell numbers are not in public directories.

The most reliable free approach is to search the number in Google and then also check it on Nomorobo.com or 800notes.com — these sites collect user reports of spam and scam calls and can tell you within seconds if a number is widely reported as a scammer.

If a number comes back as a known scam, do not call it back. If it comes back as a legitimate business, you can decide whether to call. If you cannot find any information, the safest option is to wait and see if the caller leaves a voicemail.