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 it — the number can no longer call or text you, and their calls go straight to voicemail without ringing your phone.

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. You can also block someone directly from a text message: open the conversation, tap the three dots at the top, and select Block.

Android's built-in blocking works across all apps — the blocked number can't reach you through the Phone app, Messages, or any other calling or texting service. The person won't get a notification that they're blocked, but they'll notice their calls and texts aren't going through.

Key Takeaways

  • Android's Phone app has a built-in block feature that stops calls and texts from a specific number without notifying the caller.
  • You can block a number from your call history, contacts, or directly from a text message conversation in three taps or fewer.
  • Blocked numbers can't reach you through any app — their calls go to voicemail and their texts disappear, but they won't see a "blocked" message.
  • You can unblock a number anytime by going to Settings > Apps > Phone > Permissions, or by finding the number in your blocked list and removing it.
  • If you're getting repeated calls from unknown numbers, you can turn on spam filtering in the Phone app settings to catch likely spam automatically.

Blocking from your call history

This is the most common route because you usually block a number after they've already called you. Open the Phone app and tap the Recents tab at the bottom. Scroll through your call history until you find the number you want to block.

Press and hold the number — don't tap it, hold it for a second — and a menu will pop up. Tap Block number. A confirmation message will appear saying the number is now blocked. That's the entire process.

If you want to block multiple numbers, repeat this for each one. There's no limit to how many numbers you can block on Android.

Blocking from your contacts

If the number is already saved in your contacts, open the Contacts app and find the person's name. Tap their contact card to open it, then tap the three dots or menu icon at the top right. Select Block or Block number — the exact wording depends on your phone's manufacturer, but the option will be there.

This method is useful if you want to block someone you know but don't want to delete their contact information. The contact stays in your phone; calls and texts from them just won't reach you.

Blocking from a text message

Open the Messages app and find the conversation with the number you want to block. Tap and hold the conversation thread, or tap the three dots at the top of the conversation. Look for an option that says Block, Block number, or Block contact. Tap it, and the number is blocked.

Some Android phones also let you block directly from an individual message. Open the message, tap the three dots, and select Block. The result is the same either way.

Unblocking a number if you change your mind

Open the Phone app and tap the three dots at the top right, then select Settings. Tap Blocked numbers — you'll see a list of every number you've blocked. Find the one you want to unblock, tap it, and select Unblock.

On some Samsung phones, the path is slightly different: go to Settings > Apps > Phone > Permissions > Blocked numbers. The list is the same; the navigation just varies by manufacturer. Once you unblock a number, they can call and text you normally again.

Turning on spam filtering for unknown numbers

If you're tired of blocking numbers one at a time, Android's Phone app can filter likely spam automatically. Open the Phone app, tap the three dots, and go to Settings. Look for Spam and call screen or Call Screen — again, the exact name varies by phone.

Turn on Filter spam calls or Filter unknown calls. This sends suspected spam calls straight to voicemail without ringing your phone. You can still see them in your call history if you want to check later, but they won't interrupt you.

This feature uses Google's spam database, which is updated constantly. It's not perfect — some legitimate calls might be filtered, and some spam might get through — but it catches the majority of unwanted calls without you having to block each number manually.

What happens when you block a number

When you block a number on Android, the blocked person can still call you, but the call won't ring on your phone. It goes straight to voicemail. They won't hear a message saying they're blocked; instead, they'll hear your normal voicemail greeting, which might make them think you're just not answering.

Text messages from blocked numbers also disappear — they won't show up in your Messages app at all. The sender won't get a delivery confirmation or a "message failed" error. From their perspective, the messages simply don't go through, which can feel like your phone is off or your number is disconnected.

Blocked numbers can still see your profile picture, status, or other public information if you use social media or messaging apps outside of the Phone and Messages apps. Blocking only works within Android's native calling and texting system, not across third-party apps.

Frequently Asked Questions

Can a blocked number tell they've been blocked?

Not directly. They'll notice their calls go to voicemail and texts don't deliver, but Android doesn't send them a notification saying they're blocked. Some people figure it out after repeated attempts, but there's no official "you are blocked" message.

Will a blocked number still see my online status or read receipts?

It depends on the app. In the native Phone and Messages apps, blocked numbers can't reach you at all, so status and read receipts don't apply. But if you both use WhatsApp, Facebook Messenger, or another third-party app, you'll need to block them separately in that app for the same effect.

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

Yes. Open Contacts, create a new contact with just the phone number you want to block, save it, then go back to Contacts and block it using the three-dot menu. You don't need the person's name or any other information.

What if I block a number by accident?

Open the Phone app, tap the three dots, go to Settings, select Blocked numbers, find the number, and tap Unblock. They'll be able to reach you again immediately. There's no waiting period or confirmation needed.

Do I need to download an app to block numbers on Android?

No. Android's built-in Phone app has everything you need. Third-party call-blocking apps exist, but they're not necessary for basic blocking. The native feature works across all calling and texting services on your phone.