The fastest way to block a spam call on iPhone

When a spam call comes in, you can block it when ready by tapping the call, swiping up from the bottom of the screen, and selecting Block this Caller. The number goes into your Blocked Contacts list and that caller cannot reach you again — their calls go straight to voicemail, and you will not see notifications.

If you miss the call and see it in your recent calls list, tap the information icon (the small circle with an "i") next to the number, scroll down, and tap Block this Caller. The result is the same: that number is blocked permanently until you unblock it.

This method works for any single number, but it does not stop new numbers from the same spam operation. For broader protection, you will need to turn on filtering at the system level.

Key Takeaways

  • You can block a single number during an incoming call by tapping it and selecting Block this Caller, or afterward from your recent calls list.
  • The Filter Unknown Senders setting in the Phone app silences calls from numbers not in your contacts, sending them to voicemail instead.
  • Silence Unknown Callers does the same thing but also silences calls from people who have your number but are not saved in your contacts.
  • Do Not Disturb can mute all calls except those from your contacts, but it also silences messages and alerts, so it is best for specific times.
  • Your carrier (Verizon, AT&T, T-Mobile, or others) offers its own spam filtering tools that work before calls reach your phone.

Using Filter Unknown Senders to reduce spam calls

Open the Phone app and tap the Recents tab at the bottom. Tap the three horizontal lines (the menu icon) in the upper left corner, then tap Settings. Scroll down and toggle on Filter Unknown Senders.

When this is on, calls from numbers not saved in your contacts go to voicemail and do not ring or notify you. You can still see them in your voicemail list and call them back if you choose. This catches most spam because spammers use random or spoofed numbers that are not in your contacts.

The downside is that legitimate calls from businesses, doctors' offices, or people calling you for the first time will also be silenced. You will need to check your voicemail to know they called. If you expect calls from unknown numbers, this setting may not be right for you.

Using Silence Unknown Callers for maximum quiet

Silence Unknown Callers is similar to Filter Unknown Senders but stricter. Open the Phone app, tap Recents, tap the menu icon, then Settings, and toggle on Silence Unknown Callers.

This setting silences any call from a number not in your contacts — even if that person has your number and is calling you directly. Like Filter Unknown Senders, the calls go to voicemail. The difference is that Filter Unknown Senders still rings if someone has saved your number in their phone and calls from a known contact; Silence Unknown Callers does not make that distinction.

Use this if you want almost no interruptions from unknown numbers. Check your voicemail regularly so you do not miss important calls from people trying to reach you for the first time.

Blocking calls with Do Not Disturb

Do Not Disturb is not designed specifically for spam, but it can silence unwanted calls during certain hours. Open Settings, tap Focus, then tap Do Not Disturb. Toggle it on and set the times you want it active — for example, 9 p.m. to 7 a.m.

When Do Not Disturb is on, all calls are silenced except from people in your Favorites list. You can add your family, close friends, or work contacts to Favorites so their calls still ring through. Tap the star icon next to a contact in your Contacts app to add them to Favorites.

The catch is that Do Not Disturb also silences text messages, notifications, and alerts. It is best for times when you know you will not need to be reached — late at night, during meetings, or while you are sleeping. For daytime spam blocking, Filter Unknown Senders or Silence Unknown Callers work better because they only affect calls.

Using your carrier's spam filtering service

Your phone company — Verizon, AT&T, T-Mobile, or another carrier — offers its own spam filtering tools. These work before calls reach your iPhone, so they catch spam at the network level rather than on your device.

Verizon offers Call Filter (free basic version, paid premium version with more features). AT&T offers Call Protect (free basic version, paid version available). T-Mobile offers Scam Shield (free basic version, paid version available). Contact your carrier or visit their website to turn on the free version or learn about paid options.

Carrier filtering is often more effective than iPhone's built-in tools because it uses data about known spam numbers across millions of customers. The downside is that each carrier's system works differently, and you may need to manage settings in their app rather than in your iPhone settings.

Unblocking a number you blocked by mistake

Open Settings, scroll down and tap Phone, then tap Blocked Contacts. You will see a list of every number you have blocked. Swipe left on the number you want to unblock, then tap Unblock.

Once unblocked, that number can call you again and you will see notifications as usual. If you blocked a number during a call and want to unblock it when ready, this is the fastest way.

What to do if spam calls keep coming from different numbers

If you are getting spam calls from many different numbers, blocking them one at a time will not solve the problem. Instead, turn on Filter Unknown Senders or Silence Unknown Callers (see the sections above) and contact your carrier to set up their spam filtering service.

You can also report spam calls to the Federal Trade Commission at reportfraud.ftc.gov. The FTC does not stop individual calls, but reports help them track patterns and take action against large spam operations. If you are getting calls from a specific business or scam, reporting it adds to the evidence.

Do not call back spam numbers, even to ask them to stop. Calling back confirms your number is active and often leads to more calls. Blocking and filtering are your only reliable defenses.

Frequently Asked Questions

Will the person I block know that I blocked them?

No. When you block someone, their calls go to voicemail and they receive no notification that you blocked them. They may eventually realize you are not answering, but iPhone does not send them a message saying they are blocked.

Can I block calls from a specific area code?

iPhone does not have a built-in feature to block entire area codes. Your best option is to turn on Filter Unknown Senders or Silence Unknown Callers, which will silence any call from a number not in your contacts — regardless of area code. If calls from a specific area code are harassing you, your carrier's spam filtering service may have more advanced options.

What is the difference between blocking and filtering?

Blocking stops a specific number from reaching you. Filtering silences calls from categories of numbers — like unknown senders — without blocking each one individually. Filtering is better for spam because spammers use different numbers; blocking is better for people you know and want to avoid.

If I turn on Silence Unknown Callers, will my contacts still be able to reach me?

Yes. Silence Unknown Callers only silences numbers not in your contacts. Anyone saved in your Contacts app will still reach you normally. If someone is calling you for the first time and does not have your number saved in their phone, their call will be silenced.

Can I block calls on iPhone without paying for a carrier service?

Yes. Filter Unknown Senders, Silence Unknown Callers, and blocking individual numbers are all free and built into iPhone. Your carrier also offers a free basic version of spam filtering. You only pay if you want the carrier's premium filtering service with extra features.