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When you block someone on iMessage, Apple says their messages are not delivered to you, and the person sending them is not told that they have been blocked. The block also reaches into Phone, FaceTime, Mail, and Calendar, while voicemail works differently from texts. These points come from Apple’s iOS 26 support article on blocking and its iOS 27 iPhone user guide, so they describe Apple’s documented behavior as of October 2026.
What happens to messages from a blocked contact
Apple states that messages from a blocked contact or phone number are not delivered to you. The block applies to the person or number you select, so it stops incoming messages from that contact rather than hiding a single conversation.
Whether the sender finds out
Apple’s support article Report spam and block senders in Messages on iPhone says: “The person sending the message doesn’t know that their messages are blocked.” Apple’s separate article Block phone numbers, contacts and email addresses on your iPhone or iPad adds that “the contact won’t receive a notification that the call or message was blocked.”
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Apple’s documentation does not describe a delivery status, error message, read-receipt change, or other visual sign that a sender would see. Do not assume one exists. What Apple confirms is that no notification is sent to the sender.
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Calls and voicemail
A blocked caller can still leave you a voicemail, according to Apple’s current support instructions. You will not receive a notification when that voicemail arrives, so if you are expecting a message from someone you have blocked, check your voicemail manually. Apple’s documentation describes this for its own Phone behavior; it does not establish how every carrier’s voicemail system handles blocked callers.
How far the block reaches
Blocking through Messages is not limited to text conversations. Apple says a contact blocked in Messages is also blocked in Phone, FaceTime, Mail, Calendar, and other Apple apps.
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| Apple app | Effect of blocking the contact | Source |
|---|---|---|
| Messages | Messages from the contact are not delivered; the sender is not notified | Apple iPhone user guide (iOS 27) and Apple support article on blocking (iOS 26) |
| Phone | Calls from the contact are blocked; a voicemail can still be left, with no notification to you | Apple support article on blocking (iOS 26) |
| FaceTime | Blocked | Apple iPhone user guide (iOS 27) |
| Mail and Calendar | Blocked; Apple’s documentation does not describe the app-specific behavior in detail | Apple iPhone user guide (iOS 27) |
Group conversations
Apple says you cannot block a group conversation as a whole. Its suggested alternatives are to leave the group or stop its notifications. Apple’s guidance covers the group thread itself and does not explain how a blocked person’s messages appear inside a group you remain in, so do not assume the block removes them from that group.
How to block a contact in Messages
- Open the Messages app and tap the one-to-one conversation with the person.
- Tap the person’s icon at the top of the conversation.
- Tap Info.
- Scroll down and tap Block Contact.
Apple’s steps for blocking from a Messages conversation are the ones above. Menu labels can differ between iOS versions.
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Managing blocked contacts in Settings
On iOS 26, Apple’s support article gives this path: Settings → Privacy & Security → Blocked Contacts. From that screen you can edit or remove a blocked contact. If your labels differ, check your version under Settings → General → About, because Apple’s instructions are tied to a specific iOS release.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What Apple’s documentation does not cover
The Apple pages reviewed for this article do not settle several questions readers often ask:
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- Whether blocking deletes existing conversation history.
- What happens to messages sent while a contact is blocked after you unblock them.
- Whether a sender can infer a block from any particular screen or interface state.
- How the block behaves in third-party messaging apps.
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