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. The blocked caller will go straight to voicemail and you won't see their calls or texts in your notification list. This method works on all Android phones running version 7.0 or later.

If the number is already in your contacts, open the contact, tap the three-dot menu at the top right, and select Block number. Either way takes about five seconds and requires no settings changes.

Key Takeaways

  • You can block a number directly from your call history by pressing and holding it, then selecting Block number from the menu.
  • Blocked callers hear a message saying the number is not available, and their calls and texts won't show up in your notifications.
  • Different Android phones store blocked numbers in different places — Samsung uses a separate Blocked contacts list, while others integrate it into your regular contacts.
  • You can unblock a number at any time through the same menu where you blocked it, or by finding it in your blocked list.
  • Some carriers like Verizon and T-Mobile offer additional blocking tools through their own apps, which work alongside your phone's built-in blocker.

Where Android stores blocked numbers

On most Android phones, blocked numbers live in your contacts app. Open Contacts, tap the three-dot menu, and look for Blocked contacts or Blocked numbers. The exact name and location depend on your phone's manufacturer.

Samsung phones keep blocked numbers in a separate section called Blocked contacts, found by opening Contacts and tapping the menu. Google Pixel phones show them under Settings > Apps & notifications > Notifications > Advanced > Blocked numbers. Other manufacturers like OnePlus, Motorola, and LG place them in similar locations within the Phone or Contacts app, usually under a menu labeled Blocked or Do Not Disturb.

If you can't find your blocked list, search your phone's settings for "blocked" — the search function will point you to the right place. Once you find it, you can see every number you've blocked and unblock any of them instantly.

Blocking spam and unknown numbers

Android's Phone app has a built-in spam filter that automatically blocks many robocalls and spam texts. Open the Phone app, tap the three-dot menu, go to Settings, then Spam and abuse, and turn on Filter spam calls. Suspected spam calls will be silenced and sent to voicemail without ringing your phone.

You can also block all calls from unknown numbers — people not in your contacts. In the same Spam and abuse settings, toggle Block unknown or Block calls from unknown senders (the exact wording varies by phone). This is useful if you're getting repeated calls from numbers you don't recognize, but it will also block legitimate calls from businesses, doctors' offices, and other services that use different numbers each time they call.

If you want more control, third-party apps like Truecaller, RoboKiller, and Mr. Number offer additional filtering options. These apps can identify spam before it reaches you and let you set custom rules for different types of calls.

What happens when you block someone

When you block a number on Android, the blocked caller will hear a message saying the number is not available or the call cannot be completed. They won't know they've been blocked — the experience is the same as calling someone whose phone is off or who has no service.

Blocked calls and texts won't show up in your notification list, but they still exist on your phone. If you open the Phone app and tap the Recents tab, you can still see that a blocked number called you, but you won't get a notification when it happens. The same applies to text messages — they arrive but don't trigger an alert.

Blocking only affects calls and texts from that specific number. If the person calls from a different number, you'll receive it normally. Blocking also doesn't prevent them from leaving voicemails, though you won't be notified when they do.

Unblocking a number

To unblock a number, open your Contacts app and find your blocked list. Press and hold the number you want to unblock, then tap Unblock or Remove from blocked. Alternatively, open the Phone app, go to Recents, find the blocked number in your call history, press and hold it, and select Unblock number.

Once you unblock a number, calls and texts from that person will come through normally again, and you'll receive notifications as usual. You can block and unblock the same number as many times as you need.

Using carrier blocking services

Your mobile carrier may offer its own blocking tools in addition to Android's built-in features. Verizon offers Call Filter, which identifies spam and lets you block numbers through the Verizon app. T-Mobile provides Scam Shield, which blocks known scam numbers automatically. AT&T has Call Protect. These services work alongside your phone's native blocker and can catch spam that Android's filter might miss.

Carrier blocking services are usually free, though some offer premium versions with extra features. To set up your carrier's blocker, open its app on your phone or visit the carrier's website. You can typically manage your blocked list through the app and adjust filtering levels from strict to permissive.

If you switch carriers, your Android phone's blocked list stays with you, but your carrier's blocking service won't. You'll need to set up blocking through your new carrier's app if you want to keep using their service.

Blocking contacts you know

Blocking someone in your contacts works the same way as blocking a stranger. Open your Contacts app, find the person's name, tap the three-dot menu, and select Block number. Their calls and texts will be silenced just like any other blocked number.

If you block someone and later want to see their contact information again, you can unblock them without losing their contact details. The contact stays in your phone — only the block is removed. If you want to delete the contact entirely, do that separately through your Contacts app.

Frequently Asked Questions

Can a blocked person tell they've been blocked?

No. They'll hear a message saying the number is unavailable or the call can't be completed, which is the same message they'd hear if your phone was off. They won't receive any notification that you blocked them, and there's no way for them to know from their end.

Do blocked calls go to voicemail?

Yes, blocked callers can leave voicemails, but you won't be notified when they do. If you check your voicemail manually, you'll see their message, but it won't trigger an alert on your phone.

What if someone keeps calling from different numbers?

Block each number individually as they call. If the harassment continues from many different numbers, contact your carrier's customer service — they can investigate patterns of abuse and may be able to block entire ranges of numbers or take action against the caller.

Will blocking someone delete their texts?

No. Blocking only stops new calls and texts from coming through. Any messages you received before blocking them stay in your message thread. You can delete them manually if you want to remove them from your phone.

Can I block a number without it being in my contacts?

Yes. You can block any number from your call history, even if it's not saved as a contact. Just press and hold the number in your Recents list and tap Block number.