The fastest way to stop robocalls on iPhone

iPhone has a built-in filter that blocks most robocalls before they reach you. Turn on Filter Unknown Senders in the Phone app settings, and calls from numbers not in your contacts go to voicemail instead of ringing through. This single step stops the majority of robocalls for most people.

If a robocall does get through, you can block that number when ready by tapping it in your recent calls list, selecting the info button, and choosing Block This Caller. iPhone also learns from your behavior — if you mark a call as spam, the system notes it.

For calls that are already in your contacts (which robocallers sometimes spoof), you can still block them individually, though this is less common. The key is that Filter Unknown Senders handles the volume problem without requiring you to block numbers one at a time.

Key Takeaways

  • Turn on Filter Unknown Senders in Phone settings to send unknown callers to voicemail automatically.
  • Block individual numbers by tapping the info button on a recent call and selecting Block This Caller.
  • Do Not Disturb can silence calls from non-contacts, but Filter Unknown Senders is more practical because it still lets known callers reach you.
  • Your carrier may offer additional robocall blocking through their own app or settings, separate from iPhone's built-in tools.
  • Marking calls as spam in the Phone app helps train the system, though the filter works without you doing this.

How to turn on Filter Unknown Senders

Open the Phone app and tap the Keypad tab at the bottom. Scroll to the very bottom of the screen and tap Settings. Look for the option labeled Filter Unknown Senders and toggle it on. The switch will turn green when it is active.

Once this is on, any call from a number you have not saved in your contacts will ring once and then go straight to voicemail. You will see it listed in your Recents tab, so you can still see who called and listen to any message they left. This means legitimate callers you do not know — a doctor's office, a delivery driver, a callback from a business — will also go to voicemail, so check your recent calls regularly if you are expecting contact from someone new.

If you need to reach someone who called you, tap their number in Recents and call them back. This is usually faster than waiting for them to call again.

Blocking individual robocall numbers

When a robocall gets through or you see one in your recent calls, tap the number or contact name to open the call details. Tap the info button — it looks like a circle with an "i" inside — in the top right corner of the screen.

Scroll down and tap Block This Caller. A confirmation message will appear asking if you are sure. Tap Block Contact to confirm. That number will never ring through to you again; calls from it will go straight to voicemail.

You can unblock a number the same way if you change your mind. Go to Settings, then Phone, then Blocked Contacts, find the number, and tap Edit, then Unblock.

Using Do Not Disturb as an alternative

Do Not Disturb is a different tool that silences all calls except from your contacts and favorites. To set it up, open Settings, tap Focus, then tap Do Not Disturb. Turn it on and set it to allow calls only from your contacts.

The difference between Do Not Disturb and Filter Unknown Senders is that Do Not Disturb silences your phone entirely for non-contacts, while Filter Unknown Senders still lets the calls through to voicemail. Filter Unknown Senders is usually better for robocalls because it does not interfere with legitimate calls you might be waiting for — they just go to voicemail instead of interrupting you.

Do Not Disturb is more useful if you want to silence your phone during work or sleep and only be reachable by people you know. You can schedule it to turn on and off automatically at set times.

What your carrier can block for you

Your phone carrier — Verizon, AT&T, T-Mobile, or another provider — may offer its own robocall blocking service. These tools work differently from iPhone's built-in filter because they block calls before they reach your phone at all.

Verizon offers Call Filter, AT&T offers Call Protect, and T-Mobile offers Scam Shield. Some versions are free; others charge a monthly fee. You can usually turn these on through your carrier's app or by calling customer service. Check your carrier's website to see what is available to you and whether it is already active on your account.

Using both your carrier's filter and iPhone's Filter Unknown Senders does not cause problems — they work together. Your carrier blocks what it can detect, and iPhone's filter catches what gets through.

Why robocalls still get through sometimes

Robocallers use technology to make their calls appear to come from local numbers or numbers similar to yours, a practice called spoofing. They also change their numbers constantly, so blocking one number stops only that one call. Filter Unknown Senders cannot block numbers that are in your contacts, even if a robocaller is spoofing them — though this is less common.

No filter catches every robocall. The goal is to reduce the volume to a manageable level. If you are still receiving many robocalls after turning on Filter Unknown Senders and using your carrier's filter, the calls may be coming from spoofed numbers in your own area code, which are harder to detect.

Registering your number on the National Do Not Call Registry does not stop robocalls from illegal operations, but it is free and takes two minutes. Visit donotcall.gov to register.

What to do if a robocall asks for personal information

Hang up when ready. Legitimate companies do not call asking for your Social Security number, bank details, passwords, or payment information. If a caller claims to be from your bank, Apple, the IRS, or another organization, hang up and call that organization directly using a number from their official website or your statement.

If you gave information to a robocaller by mistake, contact your bank or the relevant organization right away. Do not call any number the robocaller provided — look up the real number yourself.

You can report robocalls to the Federal Trade Commission at reportfraud.ftc.gov. This does not stop the calls to you, but it helps the FTC track patterns and take action against large operations.

Frequently Asked Questions

Will Filter Unknown Senders block calls from my doctor or dentist?

Yes, if their office number is not in your contacts. Their call will go to voicemail instead of ringing through. If you are expecting a callback, add their number to your contacts before the appointment, or check your voicemail regularly. You can also temporarily turn off Filter Unknown Senders if you are waiting for a specific callback.

Can I block all calls from a certain area code?

iPhone does not have a built-in way to block entire area codes. However, your carrier's robocall filter may have this option — check their app or call customer service. Blocking by area code can also block legitimate local calls, so most people find it too broad.

What happens to blocked calls — do they know I blocked them?

Blocked calls go to your voicemail, and the caller hears a message that the call could not be completed. They do not receive a notification that you blocked them specifically. From their perspective, it looks like your voicemail is full or your phone is off.

Does Filter Unknown Senders work if I have a business line on my iPhone?

Filter Unknown Senders applies to your entire phone, so it will send unknown business callers to voicemail too. If you need to receive calls from people who do not have your number saved, you may want to keep it off and rely on blocking individual numbers instead, or use your carrier's filter as your main defense.

Can I report a robocall number to Apple?

Apple does not have a public reporting system for robocalls. Report them to the Federal Trade Commission at reportfraud.ftc.gov or to your carrier. Your carrier uses reports to improve its own filter.