The fastest way to block a call depends on your phone type
On most phones, you can block a number right after a call ends. Open your recent calls list, find the number you want to block, and look for a block or report option — usually three dots or a menu button next to the caller's name. Tap it, then confirm. The blocked number will go straight to voicemail from that point forward, and you won't see notifications when they call.
If you want to block a number before they call again, you can also open your contacts app, search for the number, and select the block option from their contact card. Some phones let you block entire categories at once — like unknown numbers, private callers, or numbers not in your contacts — which stops most spam before it reaches you.
The exact steps and menu names vary between iPhone and Android, and between phone carriers, so the section below walks through each type. But the principle is the same: find the number, tap the menu, and select block.
Key Takeaways
- Most phones let you block a number directly from your recent calls list by tapping the menu button next to the caller's name.
- iPhone users can block numbers through the Phone app or by creating a contact and using the block option in settings.
- Android users can block numbers through the Phone app, Contacts app, or their carrier's call-blocking tool, depending on their phone model.
- Blocking a number sends their calls to voicemail and hides notifications, but they can still leave messages and reach you from a different number.
- Many phones let you block entire categories like unknown numbers or private callers, which stops most spam without blocking individual numbers.
How to block calls on iPhone
On iPhone, the easiest way to block a number is through the Phone app. Open the Recents tab at the bottom, find the number you want to block, and tap the small circle with an "i" on the right side of the entry. Scroll down and tap Block This Caller, then confirm. That number is now blocked.
If you want to block a number that isn't in your recent calls, open the Contacts app, find or create the contact, tap Edit, scroll to the bottom, and tap Block This Caller. You can also block a number by opening a text message from them, tapping the contact name at the top, and selecting Block Contact.
To block all calls from unknown numbers, open Settings, go to Phone, and turn on Silence Unknown Callers. This sends calls from numbers not in your contacts to voicemail automatically. You'll still see a record of the call, but you won't hear a ring.
How to block calls on Android
On Android, the process depends on your phone model and which version of Android you're running, but most phones work the same way. Open the Phone app, go to Recents or Call History, find the number you want to block, and press and hold it until a menu appears. Tap Block or Block Number, then confirm.
Some Android phones also let you block numbers through the Contacts app. Open Contacts, find the number, tap the menu button (three dots), and select Block. If your phone doesn't have a built-in block option, your carrier may offer a call-blocking app — check your phone's app store or your carrier's website.
To block unknown numbers on Android, open the Phone app, tap the menu button, go to Settings, and look for Call Blocking or Block Unknown Callers. Turn it on. The exact name varies by phone model, but the setting is usually in the Phone app's settings menu.
Using your carrier's call-blocking tools
Your phone carrier — Verizon, AT&T, T-Mobile, or another provider — may offer its own call-blocking service, sometimes for free and sometimes for a monthly fee. These tools can block numbers across your entire account, not just on one phone, and they often catch spam before it reaches you at all.
To find your carrier's options, visit their website or call customer service and ask about call-blocking or spam-filtering services. Verizon offers Call Filter, AT&T offers Call Protect, and T-Mobile offers Scam Shield. Each one lets you block specific numbers, block categories like spam or robocalls, and see reports of blocked calls. Some versions are free; others cost a few dollars per month.
If you use a carrier's tool alongside your phone's built-in blocking, you get two layers of protection — the carrier blocks spam before it reaches your phone, and your phone blocks any numbers you've manually added to your block list.
What happens when you block a number
When you block a number, their calls go straight to voicemail and you receive no notification that they called. You won't see their calls in your recent calls list (though some phones let you view blocked calls separately if you want to). Text messages from blocked numbers also go to a separate folder or disappear entirely, depending on your phone.
A blocked caller can still leave voicemail messages, though you won't be notified. They can also reach you from a different phone number if they have access to one. Blocking is not a legal barrier — it's a convenience tool that stops repeated calls from the same number.
If you block someone by mistake, you can unblock them the same way you blocked them: go to your block list (usually in Phone or Contacts settings), find their name, and select Unblock.
Managing your block list and adjusting settings
Over time, your block list can grow long. Most phones let you view and manage all your blocked numbers in one place. On iPhone, go to Settings, tap Phone, and scroll to Blocked Contacts. On Android, open the Phone app, tap the menu, go to Settings, and look for Blocked Numbers or a similar option.
From your block list, you can unblock numbers, add new ones, or see how many calls from each blocked number you've received. Some phones also let you export or back up your block list, which is useful if you switch phones or want to keep a record.
If you're getting a lot of spam, consider adjusting your settings to block unknown callers or enable spam filtering, rather than blocking numbers one at a time. This stops most unwanted calls before they reach you and saves you the work of managing a long block list.
When blocking doesn't work and what to try next
Blocking stops calls from the same number, but spammers often use different numbers each time they call. If you're still getting unwanted calls after blocking several numbers, the problem is likely spam or robocalls using spoofed numbers — numbers that look real but are generated by software.
In this case, blocking individual numbers won't solve the problem. Instead, enable your phone's spam filter or your carrier's call-blocking service, which catches spam patterns rather than individual numbers. You can also register your number with the National Do Not Call Registry at donotcall.gov, though this works better for legitimate telemarketers than for scammers.
If you're receiving threatening calls, harassment, or calls related to fraud, you can report them to the Federal Trade Commission at reportfraud.ftc.gov or to your local police department. Keep records of the calls — dates, times, and what was said — in case you need them later.
Frequently Asked Questions
Can someone tell if I've blocked them?
No. When a blocked caller tries to reach you, their call goes to voicemail just like any other missed call. They won't receive a message saying they're blocked, and they won't know the difference between a blocked call and a call you straightforward didn't answer.
Will blocking a number stop text messages?
Yes, on most phones. Text messages from blocked numbers either go to a separate folder or disappear entirely, depending on your phone type. The blocked person can still send messages, but you won't see notifications and the messages won't appear in your main conversation list.
What's the difference between blocking and reporting spam?
Blocking stops calls from reaching you. Reporting spam tells your carrier or phone manufacturer that the number is spam, which helps them improve their spam filters for all users. You can usually do both at the same time — most phones have a "Block and Report" option.
If I block a number, can they still reach me from a different phone?
Yes. Blocking only applies to the specific phone number you blocked. If the caller has access to another phone or number, they can still reach you. Blocking is useful for stopping repeated calls from the same number, but it won't prevent someone determined to contact you from trying a different approach.
Do I need to pay for call blocking?
Your phone's built-in blocking is free. Your carrier may offer additional spam-filtering services for a monthly fee, though many carriers now include basic spam filtering at no cost. Check with your carrier to see what's included with your plan.