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

On most phones, you can block a number right from your call log without opening any settings. When you see a call you want to block, tap and hold it (or right-click on some phones), then select "Block" or "Block number." The phone will then send future calls from that number straight to voicemail or reject them silently, depending on your device.

If you want to block a number before it ever calls you, or if you need to block multiple numbers at once, you can go into your phone's settings instead. The exact path varies: on Android, look for Phone > Settings > Blocked numbers. On iPhone, go to Settings > Phone > Blocked Contacts. Once you're there, you can add numbers manually by typing them in.

Some phones also let you block calls from unknown numbers entirely, which stops spam from numbers you've never seen before. This feature is usually in the same settings menu, often labeled "Block Unknown" or "Block Calls from Unknown Numbers." Be aware that legitimate calls — from doctors' offices, delivery services, or businesses you've contacted — may also be blocked this way.

Key Takeaways

  • The quickest way to block a number is to find it in your call log, tap and hold it, and select "Block" from the menu that appears.
  • You can manually add numbers to your blocked list through your phone's settings, usually under Phone > Settings > Blocked Numbers on Android or Settings > Phone > Blocked Contacts on iPhone.
  • Blocking a number sends calls to voicemail or rejects them silently; the caller will not hear a message saying the number is blocked.
  • Blocking unknown numbers stops calls from any number not in your contacts, but may also block legitimate calls from businesses or services.
  • Some carriers offer additional blocking tools through their own apps, which may catch spam before it reaches your phone.

Blocking calls on Android phones

Open your Phone app and go to the Recents or Call Log tab. Find the number you want to block, then press and hold it until a menu appears. Tap "Block number" or "Block." The number is now blocked and will not ring through to you.

If you want to block a number you haven't received a call from yet, open Phone > Settings > Blocked numbers. Tap the plus sign or "Add" button, then type in the number. Some Android phones also have a "Block Unknown" toggle in the same menu, which you can turn on to reject all calls from numbers not in your contacts.

To unblock a number later, go back to Phone > Settings > Blocked numbers, find the number in the list, and tap the minus sign or "Remove." The number will start ringing through again immediately.

Blocking calls on iPhone

Open your Phone app and tap Recents to see your call history. Find the number you want to block, tap the information icon (the small "i" in a circle), scroll to the bottom, and tap "Block this Caller." The number is now blocked.

You can also block a contact directly from your Contacts app. Open Contacts, find the person, tap "Edit," scroll down, and tap "Block this Contact." If you want to block a number that is not in your contacts, go to Settings > Phone > Blocked Contacts, tap "Add," and type the number in manually.

To unblock someone, go to Settings > Phone > Blocked Contacts, find the number or contact, swipe left on it, and tap "Unblock." They will be able to call you again right away.

What happens when you block a number

When you block a number, calls from that number will not ring on your phone. On most devices, the call goes straight to voicemail, but the caller does not hear a message saying they have been blocked. Instead, they hear a standard voicemail greeting or the phone rings once or twice before going to voicemail, which makes it seem like you are simply not answering.

Text messages from blocked numbers are also blocked on most phones, though the behavior varies slightly. On iPhone, blocked texts do not appear in your message threads at all. On Android, they may be filtered into a spam folder or simply not delivered, depending on your phone model and messaging app.

The person you blocked cannot tell they have been blocked just by calling you. If they suspect it, they would have to ask someone else to call you from their number, or contact you through another method like email or social media.

Using your carrier's blocking tools

Your phone company — Verizon, AT&T, T-Mobile, or another carrier — may offer its own call blocking service beyond what your phone does natively. These tools often catch spam before it reaches your phone at all, which is more effective than blocking after the fact.

Verizon offers Call Filter (free basic version, paid premium version with more features). AT&T offers Call Protect (also free basic, paid premium). T-Mobile offers Scam Shield (free basic, paid premium). To turn these on, download the app from your carrier's website or your phone's app store, or call your carrier's customer service line and ask them to activate it on your account.

These carrier tools work differently than your phone's built-in blocking. Instead of blocking individual numbers you choose, they use databases of known spam and scam numbers to block calls before they ring through. The free versions block obvious spam; the paid versions add features like reverse lookup and call recording.

Blocking robocalls and spam

Robocalls and spam calls often come from numbers that change with each call, so blocking individual numbers is not effective. Instead, use your phone's "Block Unknown" feature or your carrier's spam-blocking app, both of which stop calls from numbers not in your contacts.

If you are getting a lot of spam calls, you can also register your number on the National Do Not Call Registry at donotcall.gov. This is a free service that tells telemarketers they cannot call you. It does not stop all spam — robocalls and scams often ignore it — but it does reduce calls from legitimate businesses.

For persistent spam, consider not answering calls from unknown numbers at all. Legitimate callers will leave a voicemail, and spam callers usually will not. If you need to receive calls from unknown numbers for work or medical reasons, use your carrier's blocking app to filter the worst offenders while letting through calls that seem legitimate.

Frequently Asked Questions

Can the person I blocked tell that I blocked them?

No. When they call, they hear a normal ringing or voicemail greeting, not a message saying they have been blocked. They would have no way to know unless they ask someone else to call you from their number, or they contact you through another method and you tell them.

What if I block someone by accident?

You can unblock them immediately. On Android, go to Phone > Settings > Blocked numbers, find the number, and tap the minus sign. On iPhone, go to Settings > Phone > Blocked Contacts, find the contact, swipe left, and tap "Unblock." They can call you again right away.

Will blocking a number stop text messages too?

Yes, on most phones. Text messages from blocked numbers are filtered out just like calls. On iPhone they disappear from your threads entirely. On Android they may go to a spam folder depending on your messaging app.

Can I block calls from a specific area code?

Your phone's built-in blocking cannot do this, but some carrier apps can. Verizon Call Filter Premium and AT&T Call Protect Premium both have options to block entire area codes or number patterns. Check your carrier's app to see if this feature is available on your plan.

Why do some blocked calls still show up in my call log?

On some phones, blocked calls still appear in your call history but are marked as blocked. This is normal and does not mean the block failed. The call was rejected before it rang on your phone. You can delete these entries from your call log if you want to clean up the list.