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, and press and hold it until a menu appears. Tap Block number or Block — the exact wording depends on your phone's manufacturer. The blocked number will no longer reach you by call or text message.

If the number is not in your 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.

Once blocked, calls and texts from that number go nowhere — they do not ring your phone, do not show notifications, and do not appear in your call log. The sender will not know they are blocked; the call simply fails on their end.

Key Takeaways

  • You can block a number in seconds by opening the Phone app, pressing and holding the number, and tapping Block.
  • Blocked numbers cannot call or text you, and their messages will not appear in your call log or message threads.
  • You can block numbers from your call history, your contacts list, or directly from a text message.
  • To unblock a number, open Phone settings, find your blocked list, and remove the number from it.
  • Different Android manufacturers use slightly different menu names, but the process is the same across all Android phones.

Where to find your blocked numbers list

The location of your blocked list varies by manufacturer. On Samsung phones, open the Phone app, tap the three dots at the top right, select Settings, then Blocking. On Google Pixel phones, open Phone, tap your profile picture at the top right, go to Settings, then Blocked numbers. On other Android phones, the path is usually Phone app → Settings → Block list or Blocked numbers.

Once you find your blocked list, you can see every number you have blocked and remove any of them. Simply tap the number and select Unblock. There is no limit to how many numbers you can block, and you can add or remove them at any time.

Blocking numbers from text messages

If you receive a text from someone you want to block, you do not have to open the Phone app. Open the Messages app, find the conversation, press and hold the message or the sender's name, and look for a Block or Block sender option. This blocks the number from both calls and texts.

On some phones, you may need to open the conversation, tap the contact name at the top, and select Block from the contact details screen. The exact steps depend on which messaging app you use — Google Messages, Samsung Messages, or another default app — but all of them have a block option somewhere in the contact menu.

What happens when you block a number

A blocked number cannot reach you by phone call or text message. Their calls go straight to your voicemail (or fail entirely, depending on your carrier), and their texts do not appear in your message threads. You will not see notifications from them, and they will not appear in your recent calls list.

The person who is blocked will not receive a message saying they are blocked. Their call will simply ring on their end and then fail, or go to voicemail. They may assume you are not answering, your phone is off, or there is a network problem — they have no way to know for certain that you blocked them.

If you change your mind, you can unblock the number at any time by going to your blocked list and removing it. Once unblocked, that person can call and text you normally again.

Blocking unknown or private numbers

Some Android phones let you block all calls from unknown numbers or numbers that do not show a caller ID. On Samsung phones, open the Phone app, tap Settings, go to Blocking, and toggle on Block unknown. On Google Pixel, open Phone, tap your profile picture, go to Settings, and turn on Block unknown callers.

Be aware that blocking unknown numbers means you will miss calls from legitimate businesses, doctors' offices, and other organizations that may call from private or masked numbers. If you use this feature, check your voicemail regularly, because callers can still leave messages.

Using Do Not Disturb instead of blocking

If you want to silence calls and texts without fully blocking a number, Do Not Disturb mode is an alternative. Open Settings, search for Do Not Disturb, and turn it on. You can set it to allow calls only from contacts, which silences everyone else but does not block them permanently.

The difference is important: blocked numbers cannot reach you at all, while Do Not Disturb just silences notifications. If someone calls you during Do Not Disturb, they can still leave a voicemail, and you will see the call in your history later. Use blocking for numbers you never want to hear from, and Do Not Disturb for temporary silence.

Blocking spam and robocalls

Most Android phones come with built-in spam detection that automatically filters suspected spam calls. On Google Pixel, the Phone app shows a Spam and abuse section in Settings where you can see calls that were blocked automatically. On Samsung, open the Phone app and check the Spam tab to see filtered calls.

You can also block individual spam numbers the same way you block any other number — press and hold the call in your history and tap Block. If a spam number keeps calling from different numbers, blocking unknown callers (as described above) is more effective than blocking each number one at a time.

Frequently Asked Questions

Can a blocked number still leave me a voicemail?

This depends on your carrier and phone settings. Some carriers route blocked calls straight to voicemail, so the blocked person can leave a message. Others fail the call entirely. Check your voicemail settings or contact your carrier to see how they handle blocked numbers.

Will the person I blocked know they are blocked?

No. A blocked call simply fails on their end, and they will not receive a notification. They may think your phone is off, you are not answering, or there is a network problem. There is no way for them to know for certain that you blocked them.

Can I block a number without saving it to my contacts?

Yes. Open your call history in the Phone app, press and hold the number, and tap Block. You do not need to save it as a contact first. The number will be blocked immediately.

What if I block a number by mistake?

Open your blocked numbers list in Phone Settings, find the number, and tap Unblock. The person can call and text you normally again right away. There is no waiting period or confirmation step.

Do I need to block a number on my carrier's website too?

No. Blocking through your Android phone is enough for most purposes. Your carrier's blocking tools are separate and usually cost extra, so you only need them if your phone's built-in blocking is not working or you want additional features.