The fastest way depends on your phone type
On most phones, you can block a number directly from a call or text message without opening settings. When a call comes in, look for a "Block" or "Decline" option on the call screen itself — tap it and the number is blocked immediately. If the call already ended, open your call history, find the number, and look for a menu icon (three dots or a gear) next to it. That menu usually has a "Block" option.
If you want to block a number you haven't received a call from yet, you'll need to go into your phone's settings. On an iPhone, open Settings, tap Phone, then Blocked Contacts, then Add New. On Android, open the Phone app, go to Settings, then Blocked Numbers or Call Blocking, and add the number manually. The exact path varies by phone maker — Samsung, Google Pixel, and other Android phones have slightly different menu names — but the principle is the same.
Text messages work the same way. Open the conversation with that number, tap the menu icon, and choose "Block" or "Block This Conversation." Some phones also let you block numbers from your contacts list by opening the contact, tapping the menu, and selecting block.
Key Takeaways
- You can block a number directly from an incoming call by tapping "Block" on the call screen, without entering settings at all.
- To block a number you haven't heard from, go to your phone's settings and find the Blocked Numbers or Call Blocking section, which varies by phone type.
- Blocked numbers cannot reach you by call or text, but they can still leave voicemail on some phones — check your voicemail settings if that matters to you.
- Blocking is local to your phone only; the blocked person doesn't receive a notification, and the block doesn't affect their ability to call other people.
What happens when you block a number
When you block a number on your phone, that person cannot call you or send you text messages. Their calls go straight to voicemail (if you have voicemail set up), and their texts disappear — you won't see them in your messages app. However, the blocked person does not receive a notification that they've been blocked. Their call will simply ring on their end and then go to voicemail, so they may not know the difference between a block and you being unavailable.
Blocking is specific to your phone. If someone is blocked on your iPhone, they can still call or text anyone else, and they can still reach you from a different phone number. The block only affects that one number on that one device. If you get a new phone or switch to a different device, you'll need to re-block the number there.
On some phones, blocked callers can still leave voicemail messages, and you may still see those voicemails in your voicemail app. If you don't want to hear from them at all, check your voicemail settings — many phones let you delete voicemails from blocked numbers automatically, or you can manually delete them.
Blocking calls versus blocking texts
Most phones block both calls and texts from the same number at once. When you block a contact, you're blocking that number for all communication types. However, some older phones or certain carriers separate call blocking from text blocking, so it's worth checking your settings to confirm both are turned on if you want complete silence from that number.
If you want to block calls but still receive texts from someone (or vice versa), your phone may not support that directly. In that case, you can block the number and then manually unblock it for texts only, though this varies by phone. A simpler approach is to mute notifications from that contact instead — open the conversation, tap the menu, and choose "Mute" or "Mute Notifications." You'll still see the messages, but you won't get alerts.
Unblocking a number if you change your mind
You can unblock a number anytime by going back to your blocked list and removing it. On iPhone, go to Settings > Phone > Blocked Contacts, find the number, and tap "Edit" then "Unblock." On Android, open the Phone app, go to Settings > Blocked Numbers, find the number, and tap the minus sign or delete icon next to it.
Once you unblock a number, that person can call and text you normally again. They won't know they were blocked — there's no notification sent when you unblock someone. If you blocked them because of harassment, unblocking them means they can reach you again, so only unblock if you're sure you want to hear from them.
When blocking isn't enough
If you're receiving repeated calls from different numbers, or if blocking doesn't stop the contact, you may be dealing with spam or harassment that goes beyond a single blocked number. Many phones have a "Do Not Disturb" mode that silences all calls except from your contacts, which can help if you're getting flooded. You can also report spam calls to your carrier — most carriers have a way to report numbers through their website or app, and they use that data to improve their spam filters.
If the contact is harassing you or threatening you, blocking is a first step, but you may also want to save the messages or call logs as evidence and contact local police. If it's a business calling repeatedly about a debt, you may have legal protections under the Fair Debt Collection Practices Act, which limits how often collectors can call. Document the calls and consider consulting with a lawyer or your state's attorney general's office.
Blocking through your carrier
Your phone's built-in block is usually enough, but your carrier (Verizon, AT&T, T-Mobile, etc.) also offers call-blocking services. These work at the network level, meaning they block the call before it even reaches your phone. Carrier blocking can catch spam calls that your phone's block might miss, because it filters based on patterns the carrier detects across all its customers.
Most carriers offer free basic spam filtering, but some charge for advanced blocking features. Verizon Call Filter, AT&T Call Protect, and T-Mobile Scam Shield are the main carrier options. You can turn these on through your carrier's app or website. If you use one of these services, you still have the option to block individual numbers on your phone — they work together, not instead of each other.
Third-party blocking apps
Apps like Truecaller, RoboKiller, and Nomorobo offer additional blocking features beyond what your phone provides. These apps can block calls based on patterns (like known spam numbers), screen calls before they ring, and provide caller identification for unknown numbers. Some are free with ads, and others charge a subscription.
If you use a third-party app, it typically replaces your phone's default call screen. This means calls go through the app first, and the app decides whether to let them ring or block them. The tradeoff is that these apps have access to your call history and contacts, so check the app's privacy policy before installing. For most people, your phone's built-in blocking plus your carrier's free spam filter is sufficient, but if you get a lot of spam calls, a third-party app may be worth trying.
Frequently Asked Questions
Can someone tell if I blocked them?
No. When you block a number, the caller doesn't receive a notification. Their call goes to voicemail, and they may assume you're busy or your phone is off. They won't know for certain that you blocked them unless they try calling from a different number and you answer.
What if the same person keeps calling from different numbers?
Block each new number as it appears. If this is happening repeatedly, it may be spam or harassment. Report the numbers to your carrier and consider filing a complaint with the Federal Trade Commission at reportfraud.ftc.gov. If it's a person you know and it's threatening, contact local police.
Do I need to block a number on my email too?
Phone blocking only affects calls and texts. If someone is emailing you, you'll need to block them separately in your email app. Most email services have a "Block" or "Mark as Spam" option in the message menu.
Will blocking stop robocalls?
Blocking one robocall number stops that specific number, but robocallers often use new numbers each time. Your carrier's spam filter is more effective because it catches patterns. If robocalls are persistent, enable your carrier's call-blocking service and consider a third-party app.
Can I block a number without them knowing I blocked them?
Yes. Blocking is silent — the person won't receive a message or notification. They'll only know if they try calling and realize they can't reach you, or if they call from a different number.