By the DevX mobile testing team. We tested every call-blocking method in this guide on iPhone 16 Pro Max, iPhone 15, iPhone 14, and iPhone SE (3rd gen) running iOS 18 and iOS 17. We verified blocking from the Phone app, Messages app, FaceTime, Settings, and Contacts. We also tested Silence Unknown Callers, carrier spam blocking (AT&T, T-Mobile, Verizon), and third-party call blocking apps. All steps confirmed working as of March 2026.
Spam calls and unwanted texts are relentless. Fortunately, your iPhone has powerful built-in tools to block specific numbers, silence unknown callers, and stop robocalls. Here’s every method to take back control of your phone.
How To Block a Number From Recent Calls
This is the fastest way to block someone who just called you:
- Open the Phone app
- Tap the Recents tab
- Find the number you want to block
- Tap the ⓘ (info) icon next to the number
- Scroll down and tap Block this Caller
- Tap Block Contact to confirm
Once blocked, this person can’t call you, send you text messages, or FaceTime you. They won’t receive any notification that they’ve been blocked — calls go straight to voicemail, and messages are silently undelivered.
How To Block a Number From Messages
- Open the Messages app
- Open the conversation from the number you want to block
- Tap the contact name or number at the top of the conversation
- Tap the ⓘ (info) icon
- Scroll down and tap Block this Caller
- Confirm by tapping Block Contact
How To Block a Number From Contacts
- Open the Contacts app (or Phone → Contacts)
- Find and tap the contact you want to block
- Scroll to the bottom and tap Block this Caller
- Tap Block Contact to confirm
How To Block Unknown and Spam Callers
Silence Unknown Callers
This feature sends all calls from numbers not in your Contacts, Mail, or Messages to voicemail automatically:
- Go to Settings → Apps → Phone (on iOS 17: Settings → Phone)
- Tap Silence Unknown Callers
- Toggle it ON
How it works: Calls from unknown numbers go directly to voicemail without ringing. If someone leaves a voicemail, you’ll see it in your notifications. Numbers that have called you before or are in your recent outgoing calls will still ring through.
Caution: This will also silence legitimate calls from numbers not in your contacts — like delivery drivers, doctor’s offices, or repair services. Check your voicemail regularly if you enable this.
Carrier Spam Blocking
Major US carriers offer free spam-blocking tools:
- T-Mobile: Scam Shield (free) — automatically labels and blocks likely scam calls
- AT&T: ActiveArmor (free) — blocks fraud and spam calls
- Verizon: Call Filter (free) — detects and filters spam
Download your carrier’s app from the App Store to activate these features.
How To See Your Blocked Numbers List
- Go to Settings → Apps → Phone (on iOS 17: Settings → Phone)
- Tap Blocked Contacts
- You’ll see your complete list of blocked numbers and contacts
How To Unblock a Number
- Go to Settings → Apps → Phone → Blocked Contacts
- Tap Edit in the top right
- Tap the red minus icon next to the number you want to unblock
- Tap Unblock
Alternatively, find the contact in your Contacts app, scroll to the bottom, and tap Unblock this Caller.
How To Report Spam and Junk Messages
For iMessages and SMS from unknown senders:
- Open the spam message
- Tap Report Junk under the message (this appears for messages from numbers not in your contacts)
- Tap Delete and Report Junk
This reports the message to Apple and your carrier, and deletes it from your phone.
What Happens When You Block Someone on iPhone?
- Phone calls: Go directly to voicemail. The blocked person can still leave a voicemail, which appears in your Voicemail tab under “Blocked Messages”
- Text messages: Are silently undelivered. The sender sees no “Delivered” confirmation. On their end, iMessages will show as sent (blue) but never delivered
- FaceTime: Calls from the blocked person won’t ring on your device
- The blocked person: Receives no notification that they’ve been blocked. From their perspective, calls ring and go to voicemail (which is normal behavior when someone doesn’t answer)
More iPhone Guides From DevX
- How To Restart iPhone: Every Model (2026)
- How To Factory Reset iPhone (2026)
- How To Clear Cache on iPhone (2026)
- How To Screen Record on iPhone (2026)
- How To Connect AirPods to Any Device (2026)
Frequently Asked Questions
Can a blocked number still leave voicemail?
Yes. Blocked callers are sent directly to voicemail and can still leave messages. These voicemails appear in a separate “Blocked Messages” section at the bottom of your Voicemail tab in the Phone app.
Does blocking someone delete the conversation?
No. Blocking a number does not delete existing call history or message conversations. You’ll still see past messages and calls. To remove them, you need to manually delete the conversation.
Can I block an entire area code?
Not with the built-in iPhone blocking feature — you can only block specific numbers. However, the “Silence Unknown Callers” feature effectively blocks all numbers not in your contacts. For area code-specific blocking, use a third-party app like Truecaller, Hiya, or RoboKiller.
Is there a limit to how many numbers I can block?
Apple doesn’t impose a specific limit on blocked numbers. You can block hundreds or thousands of numbers without issues.
Will blocked numbers know they’re blocked?
Not directly. Their calls will go to voicemail (which is normal behavior), and their text messages will appear sent on their end but won’t show as “Delivered.” A persistent person might figure it out from these clues, but there’s no explicit notification.
