Free Scam Call Blocking From AT&T, Verizon and T-Mobile

AT&T, Verizon and T-Mobile all offer free scam call blocking that stops calls on the network, before your phone ever rings. On most lines it is either switched off or only half set up, because the warning label (Scam Likely) is on by default while the blocking switch often is not. Turning it on takes about five minutes per line and costs nothing. The paid upgrades mostly add caller lookup, not extra protection.

Why this matters: the numbers

• Robocall volume is not falling. The YouMail Robocall Index counted just over 3.8 billion robocalls in November 2025 alone, and 48.4 billion for the year through November, with scam and telemarketing calls making up more than half.
• Complaints jumped in 2025. The FTC's Do Not Call Data Book for fiscal 2025 recorded 2,618,077 complaints, up from 2,085,410 the year before, and about 1.6 million of them were about robocalls.
• Blocking one number at a time does not work. Our analysis of 475,404 unwanted and scam call complaints found that 56% of reported numbers got only one complaint. Scammers burn through numbers, which is why filtering at the network level beats blocking numbers yourself.
• The FCC now publishes carrier guides. In September 2026 the FCC released step-by-step guides for AT&T, T-Mobile and Verizon, noting that many of these features cost nothing extra.

Why a scam call reaches your phone at all

For most of the phone network's history, the number on your screen was simply whatever the calling system claimed. Nothing checked it. That is why caller ID has never proved anything, and why a call can look like it comes from your bank, your area code or even your own number.

The industry's answer is a call authentication system called STIR/SHAKEN. The FCC explains that the carrier sending a call now digitally signs its caller ID, and the carrier delivering it checks that signature before the call reaches you. A call that cannot be vouched for gets a weaker signature or none at all.

That is what makes the Scam Likely label possible. It is also why some scam calls still get through. Authentication tells the network how sure it can be about where a call came from, not whether the caller is honest. A small carrier can sign a call without knowing the caller plans fraud, and an operator who cycles through fresh numbers always has some with no bad history yet.

Since a 2019 FCC ruling, carriers have been allowed to block likely robocalls by default, with customers able to opt out. In practice, how much is switched on still varies by carrier and by account.

The difference between labeling and blocking

This is the most important idea on this page, and it is where nearly everyone's setup falls short.

A label relies on someone reading the screen and choosing not to answer. A person waiting to hear from a hospital, a contractor or a delivery driver will answer anything. A blocked call never creates that decision, which is why turning on blocking is worth five minutes even on a phone that already shows warnings.

AT&T: ActiveArmor

AT&T's protection runs through the ActiveArmor app. AT&T says the free version is included with every wireless plan and covers fraud and spam call blocking, plus caller ID and reverse lookup. The paid ActiveArmor Advanced costs $7 a month and adds identity monitoring, public Wi-Fi protection and similar extras, not stronger call blocking.

1. Install the AT&T ActiveArmor app and sign in with the account that owns the line.
2. Open the call protection section and turn on fraud call blocking. These calls disappear entirely.
3. Set spam risk calls to go to voicemail. Anything genuine leaves a message, and nothing in that gray area interrupts the day.
4. Skip the upgrade offer. For an older relative who will never open the app again, the free version set up once is exactly right.

Afterwards, tell them that blocked calls do not show up as missed calls either. People sometimes think something is broken when the call log suddenly goes quiet. The quiet is the feature.

Verizon: Call Filter

Verizon's free tier is called Call Filter. According to Verizon's support page, it is free on standard monthly and prepaid plans with a compatible phone, and includes spam detection, a spam filter, a log of blocked calls, an allow list and spam reporting. Call Filter Plus is $3.99 a month and mainly adds caller ID and more control.

1. On many Android phones, the Verizon Protect app comes preinstalled. On iPhone, download it from the App Store. Your phone needs Android 10 or iOS 16.6 or later.
2. Confirm the spam filter is on and that high-risk spam calls are set to be blocked.
3. If the app will not install on an older phone, switch Call Filter on from the Services & perks page in My Verizon instead.
4. Look at the blocked calls list once in the first week. If a real number is there, add it to your allowed list. After that, it can be left alone.

T-Mobile: Scam ID and Scam Block

T-Mobile splits this into two free features with confusingly similar names, and the difference is exactly the labeling versus blocking point above. T-Mobile says Scam ID labels calls as Scam Likely, while Scam Block stops those calls before they reach your phone.

1. Postpaid: open the free T-Life app, go to Scam Shield and turn on Scam Block.
2. Prepaid: no app needed. Dial #662# and press call. To turn on Caller ID on a prepaid line, dial #436#.
3. To check or undo: T-Mobile's original Scam Block announcement lists #787# to check whether Scam Block is on and #632# to turn it off.

That dial code is the most useful thing on this page when you are on the phone with a relative rather than sitting next to them. You cannot walk an eighty year old through installing an app over a call. You can ask them to type five characters and press the green button.

The three networks side by side

The pattern is the same everywhere. Free covers blocking. Paid mostly covers telling you who an unknown caller is, which is a convenience rather than protection.

Smaller carriers and prepaid brands

Mint, Visible, Cricket, Metro, Boost, Google Fi and others run on the same three networks, so some form of this protection almost always exists underneath. What changes is the name and where the switch lives.

Searching for it often lands people on third party pages selling something. The reliable route is to call the carrier on the number printed on your bill and ask one question: is there a free scam call blocking feature on this line, and is it switched on right now? If blocking is only offered as a paid add on, that is worth knowing too.

Landlines are a separate problem

Everything above is for mobile lines. A large share of the calls that reach older adults still arrive on a landline, and these app-based tools do not apply there.

• Ask the provider. Many landline providers offer call screening or anonymous call rejection, but it usually has to be requested. Call the number on the bill.
• Consider a call blocker. A device between the wall socket and the phone can screen unknown callers before the phone rings, and some models let you approve a list of allowed numbers.
• Check what is included first. If the household gets nearly all its calls from the same fifteen people, an allow list removes the problem almost entirely.

When a real call gets blocked

This is the objection that makes people switch everything off, so it is worth handling properly. It does happen, most often with a doctor's office or pharmacy calling from a poorly registered outbound line, a delivery driver calling from a personal phone, or a business that makes many calls a day.

The fix takes a minute. Open the carrier app, find the blocked or filtered list, and move that number to allowed. Two habits stop it coming up at all: save important numbers before switching blocking on, and check the blocked list once in the first week.

If someone is anxious about missing calls, start with the middle setting. A partly configured system that stays on beats a perfect one that gets switched off after three days.

What carrier blocking will not stop

Being straight about the limits matters, because a false sense of safety carries its own risk. Carrier blocking is very good at high volume robocalls, and much weaker against the calls that cost people the most money.

• Fresh numbers. A targeted call from a brand new number has no reputation yet, so nothing flags it.
• Spoofed bank numbers. A call imitating your real bank can look legitimate all the way through. Read how that script works in our report on bank callers sending couriers to the door.
• Text messages. None of these call settings filter texts, which is now where much of the scam contact arrives.
• Calls you make yourself. If you dial a fake support number from a search result or an ad, no blocking system can help. We covered how those ads get approved in our piece on how 602 million scam ads still reached people.

A ten minute setup plan

If you are setting this up for someone else, this order works.

1. Step 1: Save the numbers that matter. The doctor, pharmacy, bank, insurance office and anyone expected to call soon, before touching any blocking setting.
2. Step 2: Turn on carrier blocking. Use the section above for their network.
3. Step 3: Do the phone settings. Follow our guide to the five phone settings that stop most scam calls and texts. The carrier catches known offenders, and the phone silences the fresh numbers the carrier has never seen.
4. Step 4: Make a test call. Call from your own phone to confirm saved contacts still ring through normally.
5. Step 5: Explain it in one sentence. The phone will be much quieter now, and if it does not ring, it was not someone who needed you.

Frequently asked questions

How we researched this article

This guide is based on AT&T's ActiveArmor product page, Verizon's Call Filter support FAQs, T-Mobile's scam and spam support page and its Scam Block announcement, the FCC's explanation of STIR/SHAKEN, reporting on the FCC's 2019 default blocking ruling and its September 2026 carrier guides, the FTC's National Do Not Call Registry Data Book for fiscal year 2025, YouMail Robocall Index figures for 2025, and The Scam Exposed's own analysis of 475,404 unwanted and scam call complaints. Settings were checked against each carrier's current support pages in October 2026, and app menus can change. The Scam Exposed is an independent educational platform and is not affiliated with any carrier.