The basic method works the same way on most phones

To block a number, open your Phone app, find the number in your call history or contacts, and select the option to block. On iPhone, tap the "i" icon next to the number, scroll down, and tap "Block this Caller". On Android, long-press the number in your call history, then tap "Block number" or the trash icon depending on your phone model. The blocked number will no longer be able to call or text you — their calls go straight to voicemail, and their texts disappear without a notification to you.

You do not need to read anything or change your phone settings first. The blocking feature is built into every modern smartphone. Once you block a number, it stays blocked unless you manually unblock it later.

Key Takeaways

  • Blocking a number takes 10 seconds and uses only your phone's built-in tools — no app or service needed.
  • A blocked caller's calls go to voicemail and their texts disappear, but they will not receive a notification that they are blocked.
  • You can block from your call history, your contacts list, or directly from an incoming call by tapping "Decline" and selecting block.
  • Your phone stores a list of blocked numbers that you can view and unblock at any time if you change your mind.

Blocking from an incoming call

The fastest way to block a number is while the call is happening. When someone calls, tap "Decline" on iPhone or "Reject" on Android. On most phones, this brings up a menu with options including "Block this Caller" or "Block and Report". Tap that option and the number is blocked when ready.

This method works best when you are being called by a number you do not recognize and want to stop it right then. You do not have to answer the call first — you can block it while it is ringing.

Blocking from your call history

Open your Phone app and look at your recent calls. Find the number you want to block. On iPhone, tap the "i" icon next to it. On Android, long-press the number until a menu appears. Look for "Block number", "Block contact", or a trash icon with "Block" written next to it — the exact wording depends on your phone model and Android version.

This method is useful when you have already hung up on a spam call or unwanted number and want to prevent future calls. You can block multiple numbers this way by going through your call history one at a time.

Blocking from your contacts

If the number is already saved in your contacts, open the contact and look for a menu icon (usually three dots or lines in the top right corner). Tap it and select "Block this contact" or "Block number". On some phones, you can also swipe left on the contact name to reveal a block option.

Blocking from contacts is helpful when you want to stop hearing from someone you know — a person who keeps calling despite being asked to stop, or an old number you no longer want to hear from. The contact itself stays in your phone; only the calls and texts from that number are blocked.

Finding your list of blocked numbers

Your phone keeps a record of every number you have blocked. On iPhone, open Settings, tap Phone, then tap "Blocked Contacts". On Android, open your Phone app, tap the menu (three dots), go to Settings, then tap "Blocked numbers" or "Blocked contacts" depending on your phone.

This list lets you see at a glance who you have blocked and unblock anyone if you change your mind. straightforward tap a blocked number and select "Unblock". There is no limit to how many numbers you can block, so do not worry about running out of space.

What happens when you block a number

When you block a number, that caller cannot reach you by phone or text. Their calls go directly to your voicemail, and their text messages do not appear in your message threads. You will not see a notification that they tried to contact you — the blocked calls and texts straightforward do not show up.

The person who is blocked will not receive a message saying they have been blocked. They will just hear your voicemail greeting when they call, the same as if your phone were off. This means blocking is a quiet way to stop contact without having a conversation about it.

When blocking is not enough

If a number keeps calling from different phone numbers, blocking each one individually becomes tedious. In that case, you may want to turn on "Do Not Disturb" mode, which silences all calls except from your contacts. On iPhone, go to Settings and tap "Focus", then set up "Do Not Disturb". On Android, swipe down from the top of your screen twice and tap "Do Not Disturb".

You can also report spam numbers to your phone carrier. Call their customer service line and tell them the number is spam — they may be able to block it at the network level, which stops it from reaching any of their customers. If the calls are threatening or harassing, you can also report them to local police or the Federal Trade Commission.

Frequently Asked Questions

Will the person know I blocked them?

No. They will hear your voicemail greeting when they call, the same as if your phone were powered off. They will not receive any message or notification that you blocked them. If they text, the message will not be delivered, but they will not see a "blocked" notification.

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

Yes. You can block a number directly from your call history or from an incoming call without ever saving it as a contact. The number will be blocked whether or not it is in your contacts list.

What if I accidentally block someone I want to hear from?

Open your blocked numbers list in Settings and find the number. Tap it and select "Unblock". The person can then call or text you normally again. There is no penalty for unblocking — you can block and unblock the same number as many times as you need to.

Can I block a number on my carrier's network instead of my phone?

Yes. Most carriers offer call-blocking services through their networks. Contact your carrier's customer service to ask about their spam-blocking or call-filtering options. Some carriers charge a monthly fee for advanced blocking, while others offer basic blocking for free.

If I block someone, will they still see my calls if they call me back?

No. Blocking is one-way — you cannot receive their calls or texts, and they cannot reach you. But if you call them, they will see your call come through normally on their end.