How to Stop Spam Calls (and Keep Them Off Your Real Number)

By 2Phon Team · October 27, 2026 · 8 min read

Stop spam calls on iPhone with call screening, the spam filter, carrier blocking and the Do Not Call Registry. Then keep new spam off your real number by giving out a second one.

To stop spam calls on iPhone, turn on call screening or silencing for unknown callers and the carrier spam filter in Settings → Apps → Phone, then switch on your carrier's free spam blocking. Add your number to the National Do Not Call Registry if you're in the US, and never press keys on a robocall.

Those steps cut the noise. They don't stop the cause: your number sitting on more and more lists. The longer-term fix is to stop handing your personal number to every shop, app and listing. An iPhone app like 2Phon gives you a real second number for that, so new spam lands there instead of on the number your family and bank use.

This guide covers how to stop spam calls with each tool, what each one misses, and how to keep your real number off spam lists from now on.

Which spam-call tools work, compared

No single setting stops every spam call; each tool covers a different part of the problem. Use several together.

How to stop spam calls on iPhone

Since iOS 26, the iPhone can answer unknown calls for you, silence them, or move them into separate lists. These settings are in Settings → Apps → Phone (checked against Apple's Screen and block calls on iPhone guide for iOS 26 and iOS 27, 2026-10-27).

Screen or silence unknown callers

1. Open the Phone settings

   Open Settings, tap Apps, then tap Phone.

2. Choose how to handle unknown callers

   Under Screen Unknown Callers, pick Ask Reason for Calling or Silence.

3. Turn on Call Filtering

   Under Call Filtering, turn on Unknown Callers and Spam.

What each option does, in Apple's words:

• Never: call screening is off, and calls from unsaved numbers ring as usual.
• Ask Reason for Calling: your iPhone answers calls from unknown numbers first. Once the caller gives their name and reason, your phone rings and shows their answer, so you can decide whether to pick up.
• Silence: calls from unsaved numbers are silenced, sent to voicemail and listed in Recents.

The two Call Filtering switches tidy up your call list:

• Unknown Callers moves calls from unknown numbers out of Recents into an Unknown Callers list.
• Spam silences calls your carrier identifies as potential spam or fraud, sends them to voicemail and moves them to a Spam list. It relies on your carrier, so how much it catches depends on your carrier's support.

To see those lists, open the Phone app, tap Calls (or Recents in the classic layout), tap the filter button and choose Unknown Callers or Spam. If a real caller lands there, tap Mark as Known so their future calls skip the list.

On iOS 18 or earlier

Older versions use different names for the same idea. On iOS 18, go to Settings → Apps → Phone and turn on Silence Unknown Callers. You still get notified about calls from people in your contacts, recent outgoing calls and Siri Suggestions; everyone else goes to voicemail. In the same menu, Call Blocking & Identification → Silence Junk Callers silences carrier-flagged spam, with carriers that support it. On versions before iOS 18, the Phone settings sit directly in the main Settings list.

Block a specific number

Blocking stops calls from one number, which helps with a persistent caller but not with spam that rotates numbers.

1. Open the Phone app and tap Recents (or Calls).
2. Tap the info button next to the number.
3. Scroll down and tap Block Caller.

On iOS 26 you can also add numbers in Settings → Privacy & Security → Blocked Contacts. Apple says a blocked caller can still leave a voicemail, but you won't be notified, and they aren't told they were blocked (Apple Support: block phone numbers and contacts).

Add a call-blocking app

A call-blocking app checks incoming calls against a list of known spam numbers. Install one from the App Store, then turn it on in Settings → Apps → Phone → Call Blocking & Identification, under Call Identification apps. The FTC suggests checking ratings and expert reviews, or the list of apps kept by the wireless industry group CTIA, before you pick one (FTC: how to block unwanted calls). Some apps are free and some charge. Check what data an app collects, and read its privacy policy, before you turn it on.

Turn on your carrier's spam blocking

Carrier tools flag or block many known spam numbers, and the basic versions are often free. Some need to be switched on first. As listed on the carriers' own pages on 2026-10-27:

• Verizon says Call Filter is free for customers with a compatible device; you manage it in the Verizon Protect app (Verizon: Call Filter FAQs).
• AT&T lists "Fraud & spam call blocking" among the free features of its ActiveArmor app, which you download and set up (AT&T ActiveArmor).
• T-Mobile, other carriers and carriers outside the US have their own tools. Check your provider's website or call customer service, as the FTC suggests — some services are free and others charge.

Does the Do Not Call Registry stop spam calls?

It stops legal telemarketing, not scams. Companies that follow the law must stop sales calls to registered numbers, but the FTC is clear that being on the Registry "won't stop calls from scammers making illegal calls" (FTC: National Do Not Call Registry FAQs, checked 2026-10-27).

What the FTC says about it:

• It's free to register a home or cell phone at DoNotCall.gov, or by calling 1-888-382-1222 from the phone you want to register.
• It never expires. Your number shows up the next day, but sales calls can take up to 31 days to stop.
• Some calls are still allowed: political calls, charities, debt collectors, purely informational calls, surveys, and companies you've recently done business with or given written permission to.
• Report unwanted calls at DoNotCall.gov. If you lost money or have details about the caller, use ReportFraud.ftc.gov.

Outside the US, many countries have a similar list. In the UK it's the Telephone Preference Service (TPS): the ICO says you can register a landline or mobile number free of charge. It covers marketing calls; the ICO sends fraud and scam reports to Report Fraud instead (ICO: nuisance calls). Elsewhere, search for your country's telecom regulator and "do not call".

What to do when a spam call gets through

Don't engage: hang up, don't press anything, and don't call back. The FTC's advice for illegal robocalls is to hang up, not call back, and not press a number, which "could lead to more robocalls" (FTC: how to block unwanted calls).

Spam calls often use spoofed caller ID, so the number on your screen can look local or official while the caller is somewhere else. That's why blocking one number rarely ends it. If a caller asks for a code that was just sent to your phone, it's a scam; we explain why in what someone can do with your phone number.

Why your number gets spam calls

Spam follows your number: the more places it appears, the more calls it gets. The usual sources are:

• Sign-up forms — shops, apps, newsletters and Wi-Fi portals that ask for a phone number.
• Loyalty programs and contests — your number is often the account ID.
• Marketplace and rental listings — a public number is easy to collect.
• Data breaches — when a company you signed up with leaks its customer list.
• People-search and data broker sites — they link numbers to names and addresses.
• Bulk dialing — some robocallers dial number after number, so even a number you never shared can get calls.

You can't recall a number once it's on these lists. But you can stop adding it to new ones.

How to keep spam calls off your real number

Give a second number to anything that doesn't need your personal one, and spam from those places lands on the second number. Your personal number then stays with family, friends, your doctor and your bank, and the call filters above have much less to catch.

Use the same second number for all the "public" places. If it starts getting spam, you know where it came from — and it isn't the number that matters. This works well if you sell things online, where a listing exposes your number to strangers.

Where 2Phon fits

2Phon is an iPhone app that gives you a real second phone number from dozens of countries. It's a real mobile number, not VoIP, so popular apps accept it when you sign up and receive verification codes. You can make and receive real calls on it, and the people you call see your 2Phon number, not your personal one.

Be clear about what it does and doesn't do:

• It doesn't stop spam by itself. A second number decides where spam lands; it keeps sign-up spam off your real number.
• It's not for your bank. Your 2Phon number is yours while your subscription is active; if it lapses, the number can be released. Keep your bank and account recovery on a number you'll have for years.
• It doesn't send texts. 2Phon receives codes and handles calls.
• It's iPhone only.

Want a separate number for sign-ups and listings? Get 2Phon on the App Store — a real second number for verification codes and calls, on your iPhone.

A simple plan to stop spam calls

Turn on Ask Reason for Calling or Silence and the Spam filter, switch on your carrier's spam blocking, and register with Do Not Call if you're in the US. Hang up on anything that gets through. Then stop feeding the lists: give a second phone number to every sign-up, shop and listing from now on. When you need to call someone you don't know well, you can also hide your number when calling.

Frequently asked questions

Why am I suddenly getting so many spam calls?

Usually because your number has spread to more lists, through a sign-up, a contest, a marketplace listing, a data breach or people-search sites. Some robocallers also dial numbers in bulk, and the FTC warns that pressing a key on a robocall can lead to more of them.

Does Silence Unknown Callers block every call from a number I don't know?

It doesn't block them. Calls from unsaved numbers are silenced, sent to voicemail and listed in Recents, so you can still see them and call back. People in your contacts ring normally.

Does the Do Not Call Registry work for cell phones?

Yes. The FTC says registering a cell phone is free, works the same way as a home phone and never expires. It stops legitimate sales calls, not scammers who ignore the law.

Will a second number stop spam calls?

No number can stop spam on its own. A second number decides where spam lands. If you give it to sign-ups, shops and marketplaces, the spam those lists attract reaches the second number, not your personal one.

Can I send text messages from a 2Phon number?

No. 2Phon receives verification codes and makes and takes real calls. It doesn't send SMS or MMS of any kind.