Start with a reverse phone lookup

A reverse phone lookup searches a database using the phone number itself to find who owns it. The most straightforward free options are Google (type the number into the search bar with quotes around it, like "555-123-4567") and TrueCaller, which has a free mobile app that identifies incoming calls in real time.

Paid services like BeenVerified, Spokeo, and WhitePages offer more detailed results — they may show the person's name, address history, and whether the number is associated with known scams. These services cost between $15 and $30 for a single lookup, though some offer monthly subscriptions. The trade-off is that free lookups often return less information, especially for cell phone numbers, which are less commonly indexed than landlines.

Keep in mind that reverse lookups work best for established numbers that have been publicly listed or reported. A brand-new number, a spoofed number (one that's been faked to appear as something else), or a number used only for text messages may not appear in any database.

Key Takeaways

  • Free reverse lookups through Google or TrueCaller work for many numbers, but paid services return more detailed information about who owns a number and whether it has been reported as spam.
  • Spoofed numbers — ones designed to look like they're from a bank or government agency — will not show real ownership information in any lookup tool.
  • Your phone carrier can tell you whether a call came from inside or outside your country and sometimes block categories of calls for free.
  • If a number claims to be from a company or agency, call that organization directly using a number from their official website rather than trusting the caller's information.
  • Text messages from unknown numbers should never be answered with personal information, account numbers, or links, even if they appear to come from a trusted source.

Check whether your carrier offers call filtering

Most phone carriers — AT&T, Verizon, T-Mobile, and others — offer free or low-cost tools that identify and block spam calls before they reach you. Verizon's Call Filter, AT&T's Call Protect, and T-Mobile's Scam Shield are built into their networks and work automatically on incoming calls.

These tools label calls as "Spam Risk" or "Scam Likely" based on patterns they detect — calls from numbers that have been reported by many users, calls from known spoofing ranges, or calls that match the behavior of known fraud schemes. Some carriers offer a free basic version and a paid premium version with more aggressive blocking.

If you use a smaller carrier or a prepaid service, check your carrier's website or call customer service to ask what spam-blocking options are available. Some smaller carriers use the same infrastructure as the major three and inherit their protections automatically.

Use your phone's built-in tools

Both iPhone and Android phones have native features for managing unknown numbers. On iPhone, you can enable "Filter Unknown Senders" in Settings > Messages, which silences texts from numbers not in your contacts. On Android, the Phone app includes a "Spam and Call Screen" feature that identifies likely spam calls.

These tools do not require a subscription and work by comparing incoming calls and texts against known spam patterns. They are less sophisticated than paid services but catch the most common scams — robocalls, mass texting campaigns, and numbers flagged by thousands of other users.

You can also manually block a number on either phone by opening the call or message, tapping the information icon, and selecting "Block this Caller" or "Block Contact." Blocked numbers will not reach you, though they may still leave voicemails (which you can delete without listening).

Verify claims by contacting the organization directly

If an unknown number claims to be from your bank, the IRS, a utility company, or any other organization, do not trust the caller's word. Scammers routinely spoof the phone numbers of real companies, so the caller ID may show a legitimate number even though the call is fraudulent.

Instead, hang up and call the organization directly using a phone number from their official website or your account statement. Tell them you received a call claiming to be from them and ask whether it was legitimate. Real organizations expect this and will not be offended. If the call was a scam, the organization will want to know.

This is especially important for calls claiming to be from government agencies (the IRS, Social Security Administration, immigration services) or financial institutions. These agencies have specific protocols for contacting you, and they will never demand when ready payment or threaten arrest over the phone.

Understand what information you should never share

Unknown callers and texters should never receive your Social Security number, date of birth, account numbers, passwords, PIN codes, or credit card information. Legitimate organizations already have this information and will not ask for it over the phone or text.

Be especially cautious of unknown numbers that text you a link and ask you to "verify your account" or "confirm your identity." These are almost always phishing attempts — the link leads to a fake website designed to steal your login credentials. Even if the text appears to come from a trusted company, go directly to that company's website or app rather than clicking the link.

If you accidentally shared sensitive information with an unknown caller, contact your bank, credit card company, or the relevant organization when ready. They can monitor your accounts for fraud and help you find them.

Report spam and scam numbers

When you identify a number as spam or a scam, report it to your phone carrier and to the Federal Trade Commission (FTC). Most carriers have a way to report spam directly from the call or message — usually by tapping a menu option and selecting "Report as Spam." The FTC accepts reports at ReportFraud.ftc.gov.

Reporting helps your carrier improve its spam filters and helps the FTC track patterns in fraud schemes. If many people report the same number, your carrier is more likely to block it for everyone. The FTC uses reports to identify and pursue scammers, though they cannot investigate every report.

You can also report spam texts to your carrier by forwarding them to a short code — usually 7726 (which spells "SPAM"). This takes seconds and contributes to the carrier's database of known spam numbers.

Recognize common scam patterns

Unknown numbers often follow predictable patterns. Robocalls claiming you have a package delivery, a tax refund, or a problem with your account are extremely common. Calls claiming to be from tech support, offering to lower your credit card interest rate, or asking you to confirm a recent purchase are also frequent scams.

Legitimate companies rarely call you unsolicited about problems with your account — they send letters or emails first. If you are unsure, hang up and contact the company yourself. Scammers often use urgency ("Act now or your account will be closed") and threats ("You will be arrested") to pressure you into acting without thinking.

Text message scams often include a link and a vague message like "Click here to confirm your delivery" or "Verify your account." These are phishing attempts. Real companies do not ask you to verify sensitive information via text.

Frequently Asked Questions

Can I find out who is calling me if they are using a spoofed number?

No. A spoofed number is deliberately faked to appear as something else, so reverse lookups will show the number the scammer is impersonating, not the actual caller. Your best defense is to hang up and call the organization directly using a number you find yourself.

Is it safe to call back an unknown number?

It depends. If the number is from a local area code and you recognize the area, it may be safe. If it is from an unknown country code or a number that looks unusual, calling back could connect you to a scammer or result in charges for international calls. If you are unsure, use a reverse lookup first or contact the organization the number claims to represent.

Will blocking a number stop them from texting me?

Yes. Blocking a number prevents both calls and texts from reaching you. The blocked caller will not know they are blocked — the call or text will straightforward fail to go through on their end. You can unblock a number at any time in your phone's settings.

What should I do if I already gave my information to an unknown caller?

Contact your bank, credit card company, or the relevant organization when ready and tell them what information you shared. Ask them to monitor your accounts for fraud and to help you find them. You may also want to place a fraud alert with the credit bureaus (Equifax, Experian, TransUnion) by visiting IdentityTheft.gov.

Are paid reverse lookup services worth the cost?

Paid services return more information than free lookups, including address history and whether a number has been reported as spam. If you regularly need to identify unknown numbers, a paid service may be worth it. For occasional lookups, free tools like Google and TrueCaller usually provide enough information to decide whether to answer.