Where to find call blocking on your phone

Most phones have a built-in call blocker you control directly from the Phone app or Settings. You do not need to read anything or pay a service — the feature is already there. Where you find it depends on whether you have an iPhone or Android phone, and which version you are running.

On an iPhone, open the Phone app, find a recent call from the number you want to block, swipe left on it, and tap the red circle with a line through it. You can also go to Settings > Phone > Blocked Contacts to see your full list and add numbers manually. On Android, open the Phone app, long-press the number you want to block, and select "Block number" from the menu. Some Android phones also let you block numbers through Settings > Apps > Phone > Permissions, though the exact path varies by manufacturer.

If you cannot find the option in your phone's native app, your phone's manufacturer or carrier may have a separate app for call blocking. Check your phone's app store or contact your carrier's customer service to confirm what is available on your specific model.

Key Takeaways

  • Your phone's built-in call blocker is free and does not require an app read — it is already in your Phone app or Settings.
  • On iPhone, swipe left on a recent call and tap the block icon, or add numbers manually in Settings > Phone > Blocked Contacts.
  • On Android, long-press a number in the Phone app and select "Block number" from the menu.
  • Blocked callers will not reach you, but they may not know they are blocked — the call may ring on their end or go to voicemail depending on your carrier.
  • Some carriers and phone manufacturers offer additional blocking tools through separate apps or account settings if you need more control.

What happens when you block a number

When you block a number, calls from that number will not ring on your phone or show up in your call history. The call will not appear in your notifications, and you will not hear a sound. On the caller's end, the behavior varies: some carriers route blocked calls to voicemail, others let the call ring as if your phone is off, and some send a message saying the number is not in service.

Blocked numbers can still send you text messages unless you also block them from texting. If you want to stop both calls and texts from the same number, you may need to block them separately or use a more advanced blocking tool. Check your phone's settings to see whether blocking a number blocks calls only or both calls and messages.

Blocking unknown or private numbers

If you are getting calls from numbers that show as "Unknown," "Private," or "No Caller ID," you cannot block them the same way you block a specific number. Instead, you can silence calls from unknown callers so they go straight to voicemail without ringing.

On iPhone, go to Settings > Phone > Silence Unknown Callers. This will mute any call from a number not in your contacts. On Android, the option is usually in Settings > Apps > Phone > Call Screening or Settings > Call Settings > Block Unknown, though the exact location depends on your phone model and Android version. Be aware that some legitimate callers — banks, doctors' offices, delivery services — may show as unknown, so you may miss important calls if you turn this on.

Using your carrier's call blocking service

Your phone carrier (Verizon, AT&T, T-Mobile, or another provider) may offer a call blocking service separate from your phone's built-in blocker. These services can block calls before they reach your phone and often include options to block entire categories of calls, like robocalls or spam.

Verizon offers Call Filter, AT&T offers Call Protect, and T-Mobile offers Scam Shield. These services may be free or may charge a monthly fee depending on your plan. You can turn them on through your carrier's website or app, or by calling customer service. Carrier-level blocking can be more effective for spam and robocalls because it blocks the call at the network level rather than on your device.

Third-party call blocking apps

If your phone's built-in blocker and your carrier's service are not enough, you can read a third-party call blocking app from your phone's app store. Apps like RoboKiller, Nomorobo, and Truecaller let you block calls by category (spam, robocalls, telemarketing), report numbers that other users have flagged as spam, and set custom rules for which calls get through.

Most of these apps are free with optional paid versions that add features like call recording or advanced filtering. Keep in mind that third-party apps need permission to access your phone, contacts, and call history to work, so review what each app is asking for before you install it. Some apps may also show ads or sell anonymized data, so read the privacy policy if that concerns you.

Blocking calls from specific contacts or groups

If you want to block calls from someone in your contacts but still see their texts or emails, you can block them without deleting the contact. The contact stays in your phone, but their calls will not ring through. This is useful if you want to avoid someone temporarily without losing their information.

On iPhone, open Contacts, select the person, tap Edit, scroll down, and tap "Block this Caller." On Android, open Contacts, select the person, tap the three-dot menu, and select "Block number." You can unblock them the same way if you change your mind later. Some phones also let you create a "Do Not Disturb" exception list so certain contacts can always reach you even when your phone is in silent mode.

What to do if blocking is not stopping the calls

If you are still getting calls after blocking a number, the caller may be using a different number each time or spoofing their caller ID to make it look like they are calling from a different source. Robocalls and spam calls often do this, so blocking one number does not stop them from calling with another.

If this is happening, enable "Silence Unknown Callers" on iPhone or "Block Unknown" on Android to stop calls from numbers not in your contacts. You can also report the calls to your carrier or to the Federal Trade Commission at ReportFraud.ftc.gov. If the calls are threatening or harassing, contact your local police department and ask about filing a report. Keep a log of when the calls came in and what number showed up, as this information helps law enforcement investigate.

Frequently Asked Questions

Can someone tell if I blocked them?

Not directly from your phone. When you block someone, they will not get a notification saying they are blocked. However, they may figure it out if they notice their calls always go to voicemail or they never hear back from you. The behavior on their end depends on your carrier — some carriers let the call ring as if your phone is off, while others send it straight to voicemail.

Will blocked callers still be able to text me?

Usually yes. Blocking a number typically blocks calls only, not text messages. If you want to block both calls and texts from the same number, check your phone's settings to see if there is a separate option for blocking messages, or use a third-party app that blocks both.

What if I block someone by accident?

You can unblock them anytime. On iPhone, go to Settings > Phone > Blocked Contacts, swipe left on the name, and tap "Unblock." On Android, open the Phone app, go to Settings > Blocked Numbers, find the contact, and tap "Unblock." Once unblocked, they can call you normally again.

Do I need to pay for call blocking?

Your phone's built-in blocker is free. Your carrier may offer a free version of their blocking service or charge a monthly fee for advanced features. Third-party apps are usually free with optional paid upgrades. You do not have to pay anything to block a specific number on your phone.

Will blocking stop robocalls?

Blocking one robocall number will stop that specific number, but robocalls often come from different numbers each time. Enabling "Silence Unknown Callers" on iPhone or using your carrier's robocall filter is more effective because it stops calls from any number not in your contacts or whitelist.