The fastest way to block a number on Android

Open the Phone app, find the number you want to block in your call history or contacts, press and hold it, then tap Block number. That's the complete process on most Android phones. The blocked number can still leave voicemails, but you won't see their calls or texts in your notification list, and they won't reach your inbox.

If the number isn't in your call history yet, open Contacts, create a new contact with that number, save it, then go back and block it the same way. Some Android phones let you block directly from a text message by opening the message, tapping the three dots at the top, and selecting Block.

The exact wording and location of the block button varies slightly between Samsung, Google Pixel, OnePlus, and other Android manufacturers, but the concept is identical across all of them. We'll walk through the main variations below.

Key Takeaways

  • Most Android phones block numbers through the Phone app by pressing and holding a number in your call history, then selecting Block number.
  • Blocked numbers can still leave voicemails but their calls and text messages won't appear in your notifications or message inbox.
  • You can block a number before they ever call you by creating a contact with that number and blocking it from your contacts list.
  • Different Android manufacturers place the block button in slightly different locations, but all phones have the feature built in.

Blocking a number from your call history

Open the Phone app on your Android phone and tap the Recents or Call History tab at the bottom. Scroll through your recent calls until you find the number you want to block. Press and hold that entry until a menu appears with several options.

Look for a button labeled Block number, Block contact, or sometimes just Block. Tap it once. Your phone will confirm the block with a brief message. The number is now blocked, and you won't receive calls or texts from it going forward.

If you want to unblock the number later, go back to the same menu, find the blocked number (it may be marked with a block icon), press and hold it again, and select Unblock.

Blocking a number from your contacts

If you have the person's number saved in your Contacts app, open Contacts and find their name. Tap on the contact to open their details. Scroll down until you see a Block button or a three-dot menu icon. Tap it and confirm the block.

This method is useful when you want to block someone before they've ever called you, or when you want to block a contact you already know. The contact stays in your phone — blocking just prevents their calls and texts from reaching you.

Blocking a number from a text message

Open the Messages app and find the conversation with the number you want to block. Tap and hold the message thread until options appear. Look for Block or Block number and tap it. Some Android phones require you to tap a three-dot menu icon at the top of the conversation first, then select Block from the dropdown.

This is the quickest route if someone is texting you repeatedly and you want to stop it when ready without opening the Phone app.

Blocking unknown or private numbers

Some Android phones let you block calls from numbers that don't show up in your contacts. Open the Phone app, tap the three-dot menu at the top, and look for Settings or Call settings. Scroll down to find Block unknown, Block private numbers, or Reject unknown callers. Toggle this on.

When this setting is active, any call from a number not in your contacts will go straight to voicemail. This is useful if you're getting many spam calls, but it also means legitimate callers you don't know (like a doctor's office or delivery driver) will reach your voicemail instead of ringing through.

Not all Android phones have this feature. If you don't see it in your Phone app settings, your phone may not support it, or it might be called something different on your specific model.

What happens when you block a number

When you block a number on Android, that person's calls will not ring your phone or show up in your notification list. Their text messages will not appear in your Messages app inbox. However, they can still leave voicemails, and those voicemails will appear in your voicemail folder — they just won't notify you the way normal voicemails do.

The blocked person won't receive a message saying they've been blocked. Their call will straightforward not go through to you, and they may hear a busy signal, a message that the number is unavailable, or nothing at all, depending on your carrier.

Blocking is not the same as deleting. The contact or number remains in your phone, and you can unblock it at any time by reversing the process.

Using third-party call blocking apps

Android's built-in blocking works for most situations, but some people use additional apps like TrueCaller, RoboKiller, or Nomorobo for more advanced filtering. These apps can identify spam calls before they ring and block entire categories of calls (like robocalls or numbers flagged by other users).

These apps are optional and not necessary for basic blocking. They require you to grant them permission to access your calls and contacts, so review their privacy policies before installing. Your phone's built-in blocking will handle most unwanted numbers without needing a third-party tool.

Frequently Asked Questions

Can a blocked number tell they've been blocked?

No. A blocked number won't receive any notification that you've blocked them. Their call straightforward won't connect to you, and they may hear a busy signal or a carrier message, but they won't know it's because you blocked them specifically.

Will blocked numbers still reach my voicemail?

Yes. Blocked numbers can still leave voicemails, but you won't be notified when they do. You can check your voicemail folder manually and listen to their message if you want, but it won't alert you the way a normal voicemail does.

What if I block someone by accident?

Open the Phone app, go to your call history or contacts, find the blocked number (it may have a block icon next to it), press and hold it, and tap Unblock. The number is when ready unblocked and can call or text you again.

Can I block a number that hasn't called me yet?

Yes. Create a new contact with that number, save it, then open the contact and tap the block button. You can also paste the number into a text message, press and hold it, and block it from there without saving it as a contact first.

Do I need to turn off notifications for blocked numbers?

No. Blocking automatically silences notifications from that number. You won't see alerts for their calls or texts. If you want to receive notifications but just silence the ringer, use Do Not Disturb or mute the contact instead of blocking.