How to Stop Spam Calls on iPhone and Android (2026)

How to stop spam calls on your phone comes down to three steps: enable your device’s built-in call filtering (Silence Unknown Callers on iPhone, Call Screening on Android), register your number on the National Do Not Call Registry at donotcall.gov, and install a dedicated spam-blocking app like Truecaller or Hiya. These three layers working together block 90% or more of unwanted robocalls and scam calls on both platforms.

Americans received an estimated 55.6 billion robocalls in 2025, according to robocall tracking data from YouMail. That averages out to roughly 167 spam calls per person per year. The FCC and FTC have ramped up enforcement, and carriers have rolled out free call-filtering tools under the STIR/SHAKEN framework, yet scammers continue to evolve their tactics using VoIP technology and number spoofing. Your phone number has likely been exposed through data breaches, online forms, or data broker databases, making you a target whether you signed up for anything or not.

This guide covers every method available in 2026 to stop spam calls on both iPhone and Android. You will learn how to configure built-in phone settings, activate carrier-level protections, choose the right third-party blocking app, and register on the federal Do Not Call list. Each section is self-contained so you can jump directly to the platform or method you need.

How to Stop Spam Calls on iPhone

Apple gives iPhone users several built-in tools to fight spam calls without installing anything. The most effective is Silence Unknown Callers, which sends any call from a number not in your contacts, recent outgoing calls, or Siri suggestions straight to voicemail. This single setting eliminates most spam calls immediately, though it also silences legitimate calls from numbers you have not saved.

Enable Silence Unknown Callers

Open Settings, scroll to Phone (or search for it), then tap Silence Unknown Callers and toggle it on. When this feature is active, calls from unknown numbers will not ring your phone. They still appear in your recent calls list and go to voicemail, so you can return any legitimate call you missed. Apple introduced this in iOS 13 and has refined it through iOS 18, improving the algorithm that determines which calls to allow based on your communication history across Messages, Mail, and Contacts.

The limitation here is real: if you regularly receive calls from new numbers (delivery drivers, doctor offices, job recruiters), you may miss important calls. A workaround is to enable Silence Unknown Callers only during specific hours using Focus Mode in iOS 16 and later. Create a Focus schedule that activates the setting during evenings and weekends when most spam calls arrive, then disables it during business hours.

Activate Carrier Spam Filtering

All major US carriers now offer free spam-filtering tools that work at the network level before calls even reach your iPhone. T-Mobile Scam Shield is enabled by default for all T-Mobile and Metro by T-Mobile customers. It identifies and labels likely scam calls with a “Scam Likely” tag on your caller ID screen. The free tier blocks known scam numbers; the premium tier ($4/month) adds reverse number lookup and custom block lists. AT&T Call Protect (branded as ActiveArmor) provides free automatic fraud blocking and suspected spam labels. The Advanced tier ($3.99/month) adds reverse number lookup, custom block lists, and nuisance call blocking. Verizon Call Filter works similarly, with a free tier that labels spam calls and a Plus tier ($2.99/month for single lines) that adds a spam lookup tool and personal block list.

To check if your carrier’s protection is active, call your carrier or download their dedicated app: T-Mobile Scam Shield, AT&T Call Protect, or Verizon Call Filter from the App Store. These apps let you adjust filtering sensitivity and see a log of blocked calls. Because these tools operate at the network level, they catch calls before they hit your device and consume battery or attention. Pair carrier filtering with Silence Unknown Callers for a two-layer defense that catches the vast majority of spam.

Report and Block Individual Numbers

When a spam call gets through, open the Phone app, find the number in your Recents, tap the info (i) icon next to it, and select Block this Caller. Blocked numbers cannot call, text, or FaceTime you from that specific number. While scammers frequently rotate numbers (making individual blocking a game of whip-a-mole), blocking still reduces repeat calls from persistent robocallers that reuse the same number. You can also report spam numbers to the FTC at reportfraud.ftc.gov or call 1-888-382-1222, which feeds enforcement databases. If you use a password manager to generate unique email addresses for signups, you also reduce the number of places your phone number gets exposed through linked accounts.

Live Voicemail Screening (iOS 18+)

Starting with iOS 18, Apple introduced Live Voicemail transcription that lets you read a caller’s voicemail message in real time as they leave it. This is particularly useful when combined with Silence Unknown Callers, because you can see what the caller wants without answering. If the voicemail transcript reveals a legitimate caller (your pharmacy, a repair technician, a school), you can pick up mid-message. Scammers and robocalls rarely leave detailed voicemails, so most spam calls simply disconnect when sent to voicemail, confirming they were junk.

To ensure Live Voicemail is active, go to Settings, then Phone, then Live Voicemail, and toggle it on. The transcription happens on-device using Apple’s neural engine, so your voicemail content is not sent to Apple’s servers. This privacy-first approach makes it one of the most effective and least invasive spam-fighting tools available on any platform. If you want to find hidden apps on iPhone that might be compromising your privacy or enabling unwanted calls, check your App Library for unfamiliar applications you did not install.

How to Stop Spam Calls on Android

Android phones, particularly those running Google’s Phone app or Samsung’s native dialer, have robust built-in spam protection. Google’s call screening technology uses machine learning trained on billions of reported spam numbers to identify and filter unwanted calls before they ring. Samsung’s Smart Call feature, powered by Hiya, provides similar caller ID and spam detection on Galaxy devices.

Google Phone App Call Screening

If your Android phone uses the Google Phone app (default on Pixel phones and available for download on most Android devices), you already have access to one of the most powerful spam-filtering systems available. Open the Phone app, tap the three-dot menu, go to Settings, then Caller ID and Spam. Enable “See caller and spam ID” and “Filter spam calls.” When Filter spam calls is on, confirmed spam calls are silently rejected and sent to your spam call log. Suspected spam calls still ring but show a red “Suspected spam caller” warning on your screen.

On Pixel phones (Pixel 3 and later), you also get Call Screen, a feature where Google Assistant answers the call for you, asks the caller to state their purpose, and shows you a real-time transcript. You can then decide to pick up, mark as spam, or hang up. This is arguably the single most effective spam call tool on any smartphone because it forces the caller to interact with an AI before reaching you. Automated robocalls cannot respond intelligently to Call Screen’s questions, so they typically hang up within seconds.

Samsung Smart Call and Built-in Protection

Samsung Galaxy phones include Smart Call, which is powered by Hiya’s database of known spam numbers. To enable it, open the Phone app, tap the three-dot menu, select Settings, then Caller ID and spam protection, and toggle it on. Smart Call identifies incoming callers by name when possible (even if not in your contacts) and warns you about suspected spam with a label. Samsung also offers a separate block list where you can block all calls from numbers not in your contacts, similar to iPhone’s Silence Unknown Callers.

To set up blocking unknown callers on Samsung, go to Settings, then Apps, then Phone, then tap Block numbers, and enable “Block calls from unknown numbers.” Be aware this blocks all calls from numbers not saved in your contacts, which has the same trade-off as Apple’s equivalent: you might miss legitimate calls from new numbers. Samsung’s One UI 6 and later also allows you to create automated rules using Bixby Routines to enable unknown caller blocking during certain hours, providing the same scheduled protection as iPhone’s Focus Mode approach.

Carrier Protections on Android

The same carrier tools available on iPhone work on Android. Download T-Mobile Scam Shield, AT&T Call Protect (ActiveArmor), or Verizon Call Filter from the Google Play Store and follow the setup prompts. These apps integrate with your Android dialer to label and block spam calls at the network level. T-Mobile customers on Android can also dial #662# to enable free Scam Block, which prevents calls flagged as scams from reaching your phone entirely, without needing the app.

For Android users on smaller carriers or MVNOs (Mint Mobile, Visible, Cricket, Google Fi), your carrier may not offer a dedicated spam-blocking app. In that case, the Google Phone app’s built-in filtering becomes your primary network-independent defense. Google Fi users benefit from integrated spam filtering that works at both the network and device level, making it one of the most spam-resistant carrier options available. Consider using a VPN to protect your number and personal data when browsing online, which reduces the chance of your phone number being harvested by data brokers and scam operations.

Best Spam Call Blocker Apps Compared

Third-party spam blocking apps add an additional layer of protection beyond what your phone and carrier provide. These apps maintain their own databases of known spam numbers (often larger and more current than carrier databases), offer community-driven spam reporting, and provide features like reverse number lookup and custom blocking rules. The trade-off is that some require access to your call log and contacts, raising privacy considerations you should evaluate.

Which Spam Blocker App Should You Choose?

If privacy is your top concern, Hiya is the strongest choice because it does not require you to upload your contacts to a shared database. Hiya’s business model is built on partnerships with carriers and phone manufacturers (it powers Samsung’s Smart Call and is used by AT&T), so it has a strong incentive to maintain user trust. The free tier provides caller ID and spam warnings; the premium tier adds automatic blocking and a spam lookup tool.

Truecaller has the largest community-powered database (over 2 billion numbers identified) and is the most popular spam blocking app globally with 400+ million users. Its crowd-sourced approach means new spam numbers get flagged quickly. The catch is that Truecaller asks permission to upload your contact list to its global directory, which is how it can identify callers for other users. If you are comfortable with that trade-off, Truecaller’s caller ID accuracy is hard to beat.

Nomorobo is the budget pick at $1.99/month and was one of the first FTC-recognized robocall blocking solutions. It is particularly effective for VoIP landlines, where it remains free. On mobile, it provides solid basic blocking without excessive permissions. RoboKiller takes the most aggressive approach with its Answer Bots feature, which uses AI to engage scammers in conversation, wasting their time and resources. At $4.99/month, it is the most expensive option but appeals to users who want to fight back rather than just block.

Register on the Do Not Call List

The National Do Not Call Registry is a free service operated by the Federal Trade Commission (FTC) that reduces telemarketing calls to your phone number. Registration is permanent (it does not expire) and covers both cell phones and landlines. While it does not stop all spam calls (illegal robocallers ignore the registry), it significantly reduces calls from legitimate telemarketers and businesses that follow the law.

How to Register Your Number

Visit donotcall.gov and enter the phone number you want to register along with your email address. You will receive a confirmation email; click the link to complete registration. You can also register by calling 1-888-382-1222 from the phone number you want to add. Registration takes effect within 31 days. After that, telemarketers covered by the FTC‘s Telemarketing Sales Rule are legally required to stop calling your number. Companies that violate the Do Not Call rules face fines of up to $50,120 per call as of 2026.

You can register up to three phone numbers per email address through the website. There is no limit when registering by phone (one number per call). To verify your number is already registered or to check your registration status, visit donotcall.gov/confirm and enter your information.

What the Do Not Call Registry Does Not Cover

The registry does not stop calls from political organizations, charities, telephone surveyors, or companies you have an existing business relationship with (they can call you for up to 18 months after your last transaction). It also does not stop illegal robocalls and scam operations that operate outside the law. This is why the Do Not Call Registry should be one layer of your defense, not your only one. The FTC uses the registry’s complaint data to build enforcement cases against violators, so reporting calls that come through after you are registered (at donotcall.gov or reportfraud.ftc.gov) directly contributes to catching scammers.

If you continue to receive calls after registering and waiting the 31-day activation period, file a complaint with the FTC including the caller’s number, the date of the call, and whether it was a robocall or live person. The FTC has brought hundreds of enforcement actions against Do Not Call violators, resulting in billions of dollars in penalties. Your complaint makes a difference even if the outcome is not immediate.

Why You Get So Many Spam Calls

Understanding why spam calls target you helps you prevent them at the source rather than just blocking them after they arrive. Three primary mechanisms drive the spam call ecosystem: data brokers selling your phone number, call spoofing technology that disguises caller identity, and the economics of robocalling that make it profitable even with low success rates.

Data Brokers and Phone Number Exposure

Your phone number enters the spam ecosystem through data brokers, companies that collect, aggregate, and sell personal information. When you enter your phone number on a website form, sign up for a loyalty program, download an app that requests contact access, or have your data exposed in a breach, that number can end up in broker databases. Companies like Spokeo, WhitePages, BeenVerified, and Intelius compile billions of records and sell access to marketers, skip tracers, and (indirectly) scammers who purchase bulk phone number lists.

To reduce your exposure, you can opt out of major data brokers individually. Spokeo’s opt-out is at spokeo.com/optout. WhitePages offers removal at whitepages.com/suppression-requests. The process is tedious because there are hundreds of brokers, but services like DeleteMe ($129/year) and Kanary automate the removal process across 30+ brokers. Fewer databases holding your number means fewer spam calls over time. This is a long-term strategy that compounds in effectiveness as your number gradually disappears from broker listings. Using Lockdown Mode on your iPhone adds another layer of protection by restricting how apps and websites can access your device data.

Call Spoofing and Neighbor Spoofing

Call spoofing is the practice of deliberately falsifying the caller ID information displayed on your phone to disguise the caller’s true identity. Scammers use VoIP (Voice over Internet Protocol) technology that allows them to set any phone number as their outgoing caller ID, often choosing numbers with your same area code and prefix (known as “neighbor spoofing”) to increase the chance you answer. This is why you sometimes receive spam calls from numbers that look like they could be your neighbor, a local business, or even your own number.

The STIR/SHAKEN framework (Secure Telephone Identity Revisited / Signature-based Handling of Asserted information using toKENs) is the industry-wide technical standard mandated by the FCC in 2021 to combat call spoofing. STIR/SHAKEN is a set of protocols that allows phone carriers to verify that the calling number displayed on your caller ID actually belongs to the caller. Each call receives an attestation level: “A” (full attestation, the carrier verified the caller has the right to use that number), “B” (partial attestation, the carrier verified the caller but not the specific number), or “C” (gateway attestation, the carrier can only verify where the call entered the network).

Since STIR/SHAKEN became mandatory for large carriers, carriers can flag or block calls that fail authentication. This is the technology behind the “Scam Likely” and “Spam Risk” labels you see on your phone. However, STIR/SHAKEN is not a complete solution: smaller carriers and international calls are not always covered, and determined scammers can still find ways to manipulate the system. As of 2026, the FCC has extended STIR/SHAKEN requirements to smaller carriers and gateway providers, closing some of the remaining loopholes.

The Economics of Robocalling

A robocall is an automated telephone call that delivers a pre-recorded message using computerized auto-dialers. Robocall technology has become so inexpensive that scammers can make thousands of calls per minute at a cost of fractions of a cent per call using VoIP services. Even if only 0.1% of recipients fall for a scam, the return on investment remains positive because the cost of making calls is essentially zero. A single successful scam can net hundreds or thousands of dollars, making the economics highly favorable for criminal operations.

The FCC reported that consumers lost an estimated $29.8 billion to phone scams in 2024. Common scam types include fake IRS/tax calls, Social Security fraud alerts, auto warranty extensions, student loan forgiveness offers, and tech support scams. The volume of robocalls has decreased from the 2019 peak (58.5 billion) thanks to STIR/SHAKEN enforcement and carrier filtering, but remains above 50 billion annually in the US. Ongoing FCC enforcement actions, including record fines against major robocall operations, continue to chip away at the problem. The FCC issued its largest-ever fine of $299 million against an auto warranty robocall scheme in 2024.

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If spam calls are accompanied by suspicious texts and unauthorized charges, your phone may be hacked. Install antivirus software to scan for call-intercepting malware that redirects your number.

Frequently Asked Questions

Does the Do Not Call Registry stop all spam calls?

No. The National Do Not Call Registry only stops calls from legitimate telemarketers who follow FTC rules. It does not stop illegal robocalls, scammers, political calls, charities, or companies you have done business with in the past 18 months. Use it as one layer alongside device settings and spam-blocking apps for the best protection against unwanted calls.

Can you stop spam calls permanently?

You cannot eliminate spam calls 100%, but combining three defenses reduces them by 90% or more: enable your phone’s built-in call filtering (Silence Unknown Callers on iPhone, Call Screen on Pixel), activate your carrier’s free spam protection (T-Mobile Scam Shield, AT&T Call Protect, or Verizon Call Filter), and opt out of data broker databases that sell your phone number to marketers and scammers.

Is Truecaller safe to use?

Truecaller is generally safe and used by over 400 million people globally. The privacy consideration is that it uploads your contact list to its shared database, which is how it identifies unknown callers for other users. If this concerns you, Hiya offers similar spam blocking without uploading your contacts. Review each app’s permissions carefully before installing and only grant access to call logs and contacts if you accept the trade-off.

What is STIR/SHAKEN and how does it stop spam calls?

STIR/SHAKEN is a technical framework mandated by the FCC that requires phone carriers to verify the authenticity of caller ID information before delivering calls. When a call passes STIR/SHAKEN verification, your carrier knows the calling number is legitimate. Calls that fail verification get flagged as “Scam Likely” or blocked entirely. Since its 2021 mandate, STIR/SHAKEN has reduced spoofed robocalls significantly.

Why do spam calls come from local numbers?

Scammers use a technique called neighbor spoofing, where they falsify their caller ID to display a phone number with your same area code and prefix. This tricks you into thinking a local person or business is calling, increasing the odds you answer. STIR/SHAKEN verification helps carriers detect these spoofed numbers. Your carrier’s spam-filtering app can identify and label neighbor-spoofed calls before they ring your phone.