How to tell if a call is AI: signs and phone settings

You often cannot tell if a call is AI just by listening, and the FBI says so plainly: AI-generated voices can sound nearly identical to the real person. The reliable test is to hang up and call back on a number you already know, and to let your phone's call screening answer unknown numbers first.

There are still a few signs worth knowing, and some settings on iPhone and Android that cut down how many of these calls reach you.

Signs a call might be an AI voice or a robocall

None of these proves anything on its own. Together, or combined with a request for money or information, they are a reason to end the call.

It is a recording, not a person. The FTC's robocall page defines it simply: if you answer and hear a recorded message instead of a live person, it is a robocall. A robocall trying to sell you something is illegal unless the company got written permission directly from you.
Lag before each reply. The FBI lists "voice call lag time" as one of the imperfections to watch for in its May 2025 warning about AI-generated voice messages.
The voice does not quite match. The FBI also lists "voice matching" among the things to check.
Odd wording. The FBI says to listen closely to tone and word choice. Phrases the person would never use, or a strangely formal or flat way of speaking, are worth noticing.
Urgency and a payment request. The FTC lists demands for immediate payment by wire transfer, gift cards, payment apps or cryptocurrency as signs of a scam.
Caller ID that looks official. The FTC warns that scammers can fake the name and number that shows up, so a call can look like it comes from a government agency or your bank.

One more thing from the FBI's December 2024 AI fraud warning: generative AI can correct for the human errors that used to give scams away. Clean grammar and a convincing voice are no longer signs that a call is genuine.

How to check whether a caller is real

Since you cannot rely on your ears, check the person instead of the voice:

Do not share anything yet. No codes, passwords, account numbers or payment details.
Ask a question only the real person would know. Something that is not on social media.
Ask for your family safe word, if you have one. The FBI recommends creating a secret word or phrase with your family.
Hang up and call back yourself. The FBI says to research the organization's number or use a number you already have for the person, then call directly. Do not use a number the caller gives you.
If someone you know calls from a new number, confirm through a contact method you already trusted before acting, as the FBI advises.

If the call claims to be a family member in trouble, our guide to AI voice cloning scams walks through that exact scenario, including what to do if money was already sent.

Is it illegal to use AI voices in robocalls?

Yes, in the US. On February 8, 2024, the FCC announced a unanimous Declaratory Ruling that calls made with AI-generated voices are "artificial" under the Telephone Consumer Protection Act, effective immediately.

What that means in practice, according to the FCC:

AI voice calls are held to the same rules as other artificial or prerecorded voice calls. Telemarketers need your prior express written consent before robocalling you.
The FCC can fine robocallers and take steps to block carriers that carry illegal robocalls.
State Attorneys General get new tools to go after the people behind these calls.
The TCPA lets individuals and organizations bring lawsuits against robocallers.

The ruling does not stop scammers from calling. It does mean an unwanted AI voice call is a violation in itself, which is one more reason to report it.

Call screening on iPhone

Apple's iPhone User Guide describes these settings for the current iOS version.

Screen or silence unknown numbers

Open the Settings app.
Tap Apps, then tap Phone.
Choose one of the options:
- Never: Call Screening is off and your iPhone rings for unsaved numbers.
- Ask Reason for Calling: calls from unknown numbers are asked for more information before your iPhone rings.
- Silence: calls from unsaved numbers are silenced, sent to voicemail and shown in Recents.

With Ask Reason for Calling, your iPhone answers, the caller gives a name and reason, and then your phone rings and shows the response so you can decide whether to pick up. A recording or a bot that cannot answer the question is easy to ignore.

Filter unknown and spam calls

In Settings, Apps, Phone, turn on Unknown Callers (calls from unknown numbers go to an Unknown Callers list) and Spam (calls your carrier identifies as potential spam or fraud are silenced, sent to voicemail and moved to a Spam list).

Turn on call identification

In Settings, Apps, Phone, tap Call Blocking & Identification, and turn on Business Call Identification or a supported call identification app.

Block a number

In the Phone app, tap Contacts, tap the contact, then tap Block Contact.

Call screening on Android

These steps are for the Phone by Google app, from Google's Phone app Help. Other phone makers' dialers use different menus.

Call Screen

Google's Call Screen page says to open the Phone app, tap More, then Settings, then Spam and Call Screen or Call Screen, and choose Maximum protection, Medium protection or Basic protection on Pixel 7 and later. The assistant asks callers who is calling and why, hangs up on spam, and lets real calls ring with a transcript. Automatic screening is on Pixel phones in Australia, Canada, Ireland, the UK and the US, and manual screening is also on selected Android devices in the US and Canada. Google notes that not all spam calls and robocalls can be detected.

Caller ID and spam protection

From Google's caller ID and spam page: open the Phone app, tap More options, then Settings, then Caller ID and spam. Turn on See caller ID & spam, and optionally Filter spam calls. Calls labeled "Suspected spam caller" or "Spam" may be spam. Google also describes fake call detection, which alerts you if a caller hides their identity or impersonates a contact. It needs Android 12 or later, the Phone by Google, Contacts and Google Messages apps, and RCS turned on in Google Messages.

Scam Detection on Pixel

Google's Scam Detection page describes an on-device feature that alerts you during a call if a scam is likely. It is off by default; turn it on under Phone app, More, Settings, Scam Detection. It works on Pixel phones only (Pixel 6 and later in the US, with a shorter list for other countries), plays an audible beep at the start of the call and every few minutes so the other side knows it is on, and Google says it is not 100% accurate.

What to do after a suspicious call

Hang up and do not press any numbers. The FTC says pressing a number could lead to more robocalls.
Block the number in your phone app, and ask your carrier what blocking it offers.
Report it. Unwanted calls go to DoNotCall.gov. If you lost money or shared information, report at ReportFraud.ftc.gov and at the FBI's ic3.gov. The FTC asks for the number that called, the caller ID shown (even if fake), any callback number, and the date and time.
If you gave out a password or code, change it and turn on two-factor sign-in. See is two-factor authentication safe and what to do if your email is hacked.

Frequently asked questions

Can you tell if a voice is AI generated just by listening?

Not reliably. The FBI says AI-generated content is often difficult to identify and that cloned voices can sound nearly identical to real ones. Lag, mismatched voice and odd wording are clues, not proof.

Does Call Screening stop AI calls?

It filters them. On iPhone, Ask Reason for Calling makes unknown callers explain themselves before your phone rings. On Pixel, Call Screen can hang up on spam. Neither catches everything, and Google says so directly.

What if a caller ID shows my bank or a government agency?

Do not trust it. The FTC says scammers can fake the name and number shown. Hang up and call the number on your card or the agency's official site.

Are AI robocalls illegal?

In the US, yes. The FCC ruled in February 2024 that AI-generated voices are "artificial" under the TCPA, so the same consent rules apply as for other robocalls.

Should I talk to the caller to test whether it is AI?

Keep it short. Do not confirm personal details, and do not press numbers. Hanging up and calling back on a known number answers the question faster.

Keep your inbox out of the same scams

Calls are only one channel. The FBI notes that the same impersonation scams arrive as texts and messages with links, and email works the same way. With Secria Mail you can give each site its own alias, so if one leaks or starts getting targeted phishing, you know where it came from and can delete the alias. Tracking pixels are removed automatically and senders never see your IP address. Sign-up needs no phone number. Create a free account.