The fastest way to block a caller depends on your phone type

On most phones, blocking a caller takes under 30 seconds. If you have an iPhone, open the Phone app, find the number in your recent calls or voicemail, tap the info icon (a circle with an "i"), scroll down, and tap "Block this Caller". On Android, open the Phone app, find the number, press and hold it, then tap "Block number" or the block icon — the exact wording varies by manufacturer and Android version.

If you do not have the number saved as a contact, you can still block it. The steps are the same: locate the number in your call history or a text message, open its details, and select the block option. Once blocked, that number cannot call or text you, and their calls go straight to voicemail without your phone ringing.

Some people block callers from their voicemail app instead of the Phone app. This works, but the Phone app method is more reliable because it blocks the number at the system level rather than just filtering voicemail.

Key Takeaways

  • iPhone users tap the info icon next to a recent call or voicemail, scroll down, and select "Block this Caller".
  • Android users press and hold a number in the Phone app and tap the block option, which appears as a menu item or icon.
  • Blocked callers cannot reach you by phone or text, and their calls route to voicemail without ringing your phone.
  • You can unblock a number at any time by going to your phone's settings, finding the blocked list, and removing the number.
  • Blocking a caller on your phone does not stop them from leaving voicemail, though you will not be notified when they do.

Where to find your blocked list and unblock a number

On iPhone, go to Settings, tap Phone, then tap "Blocked Contacts". You will see every number you have blocked. To unblock someone, swipe left on their name and tap "Unblock", or tap "Edit" in the top left corner and then the minus sign next to their name.

On Android, the blocked list location varies. Most phones have it in the Phone app settings — open Phone, tap the three-line menu icon, go to Settings, then look for "Blocked numbers" or "Call blocking". Samsung phones keep it under Phone > Settings > Reject calls. Google Pixel phones use Phone > Settings > Blocked numbers. If you cannot find it in the Phone app, check your Messages app, which often has its own block list for text messages.

Once you find your blocked list, unblocking is straightforward: select the number and tap "Unblock". The person can then call or text you normally again. Unblocking does not notify them that you have unblocked them.

Blocking calls from unknown or private numbers

If you are getting calls from numbers that show up as "Unknown", "Private", or "No Caller ID", you cannot block them the same way because there is no specific number to block. Instead, you need to use your phone's call-filtering settings.

On iPhone, go to Settings, tap Phone, then turn on "Silence Unknown Callers". This sends all calls from numbers not in your contacts straight to voicemail. You will not see a notification, but you can check voicemail later to see if anyone left a message. This is the most effective way to stop spam calls from spoofed or hidden numbers.

On Android, open the Phone app, tap the three-line menu, go to Settings, then look for "Spam and call screen" or "Call blocking". Turn on "Filter unknown calls" or "Block unknown callers" — the exact name depends on your phone. Some Android phones also let you report a number as spam directly from the call screen, which helps Google and your carrier identify spam patterns.

Using your carrier's call-blocking tools

Your phone company — Verizon, AT&T, T-Mobile, or another carrier — offers its own call-blocking service, often free or for a small monthly fee. These tools work at the network level, meaning they block calls before they reach your phone. This is more powerful than blocking on your phone itself because it stops spam calls from ever connecting.

Verizon offers Call Filter (free basic version, paid premium version with more features). AT&T offers Call Protect (free basic version). T-Mobile offers Scam Shield (free). To turn these on, log into your carrier's website or app, find the call-blocking section, and enable it. You can usually add numbers to a block list, and the service will automatically flag suspected spam calls.

Carrier-level blocking is worth setting up if you receive many spam or unwanted calls, because it reduces the volume before it reaches your phone. However, it does not replace blocking individual callers — you still need to block specific numbers on your phone if you want to prevent someone you know from reaching you.

What happens when you block someone

When you block a caller on your phone, several things happen. Their calls no longer ring your phone — instead, they go directly to voicemail. They will not see a message saying they are blocked; instead, they will hear a standard voicemail greeting or a message saying your voicemail is full (depending on your carrier). Text messages from a blocked number are usually hidden from your main message thread, though some phones let you view them in a separate blocked messages folder.

The blocked person does not receive a notification that you blocked them. If they call you, they will not hear a busy signal or a message saying "this number is blocked" — they will straightforward reach voicemail. This is by design: blocking is meant to be quiet and not escalate conflict.

Blocking is not the same as reporting spam. If you block a number, only you stop receiving calls from it. If you report a number as spam to your carrier or to apps like TrueCaller, you help other people by flagging it as a known spam source. Many phones let you block and report in one action.

Blocking callers through third-party apps

If your phone's built-in blocking tools are not strong enough, you can read a call-blocking app. Popular options include TrueCaller (free and paid versions), RoboKiller (paid subscription), and Nomorobo (free for landlines, paid for mobile). These apps use databases of known spam numbers and machine learning to identify unwanted calls before they reach you.

Third-party apps work differently depending on the platform. On iPhone, they cannot block calls at the system level like your carrier can, so they are less effective than Android apps. On Android, some apps can block calls before your phone rings, making them more powerful than your phone's built-in tools.

If you choose to use a third-party app, read the privacy policy first. Call-blocking apps need permission to see your call history and contacts, so make sure you trust the company before installing. Free versions often show ads or have limited features; paid versions typically offer more control and fewer ads.

Blocking callers on older phones or landlines

If you have an older phone without a modern operating system, or if you use a landline, blocking works differently. Many older phones have a "Reject" or "Block" option in the call menu, but the exact steps depend on the phone model. Check your phone's manual or call your carrier to ask how to block a number on your specific device.

For landlines, your carrier usually handles blocking through a service like Call Block or Anonymous Call Rejection. Call your phone company and ask them to add a number to your block list. They can often do this over the phone in minutes. Some carriers charge a small monthly fee for this service; others include it free.

If you use a VoIP service like Ooma or Magicjack, blocking is usually done through the service's website or app rather than on the phone itself. Log into your account, find the call-blocking or blocked numbers section, and add the number there.

Frequently Asked Questions

Can someone tell if I blocked them?

No. When you block a caller, they reach your voicemail without hearing any message that says they are blocked. They will not receive a notification or see any indication that you blocked them. The only way they would know is if you tell them or if they notice a pattern of always reaching voicemail.

What if I block someone by mistake?

You can unblock them when ready. Go to your blocked list in Settings (iPhone) or Phone app (Android), find their name, and tap "Unblock". Once unblocked, they can call and text you normally. Unblocking does not notify them that you unblocked them.

Do blocked callers still reach my voicemail?

Yes. Blocked callers can still leave voicemail messages, but you will not receive a notification when they do. You can check your voicemail manually to see if they left a message. Some phones let you delete voicemail from blocked callers without listening to it.

Can I block a number if I do not have it saved as a contact?

Yes. You do not need to save a number as a contact to block it. Find the number in your recent calls, voicemail, or text messages, open its details, and select the block option. The number will be blocked whether or not it is in your contacts.

Will blocking someone stop them from texting me?

Yes, on most phones. When you block a number, text messages from that person are usually hidden or moved to a blocked messages folder. You will not receive notifications for their texts. However, some older phones or carriers may not block texts the same way they block calls, so check your phone's settings to confirm.