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This wikiHow teaches you how to block text messages from unknown contacts or phone numbers. To block messages from unknown numbers, this number must have contacted you.
Steps
Block someone on Messages
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Open 
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Messages on iPhone. Tap the Messages app icon, which looks like a white conversation bubble on a green background.
- This is great for blocking future messages from anyone, whether in your contacts or not. If you want to block a contact before they can text you, use the next method.
- If the number has already called you, you can block it by opening the Phone app, tapping the Recents tab, and then skipping to the next step.
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Select a message. Tap the message from the person you want to block. You can block any contact or phone number that has texted you.
- If Messenger opens a conversation, tap the “Back” button in the upper-left corner of the screen to close the conversation.
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Tap the ⓘ- shaped button in the upper-left corner of the screen. The details of the conversation will appear.
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Tap the sender’s name or phone number. The contact information screen opens.
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Scroll down and tap Block this Caller . The option is at the bottom of the detailed list.
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Tap Block Contact when it appears. This contact or phone number will be added to the blacklist on iPhone. All future messages from them will not be able to reach you, nor will the sender be notified that he or she has been blocked. [1] X Research Source
- If you need to remove a phone number or contact from the blacklist, go to Settings → Tap Messages → Select Blocked → Tap Edit → Tap the – next to the contact/number phones in the list to unblock them.
Block contacts in Settings
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Open 
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Settings on iPhone. Tap the gear-shaped app icon in the gray frame.
- This is ideal if you want to block someone from your contacts before they have a chance to text you, but it doesn’t work with unknown numbers. If you want to block random phone numbers, use the first way.
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Scroll down and tap Messages . The option is in the bottom half of the Settings page.
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Scroll down and tap Blocked . The option is in the middle of the page, under the heading “SMS/MMS”.
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Scroll down and tap Add New… . The action is at the bottom of the blocked numbers list.
- If you haven’t blocked a number yet, there’s no need to scroll down.
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Select a contact. Scroll through the contact list until you find the person you want to block, then tap their name. So this person will be added to the blocked list.
Filter iMessages from unknown numbers
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Open
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Settings on iPhone. Tap the gear-shaped app icon on the gray frame.
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Scroll down and tap Messages . This is the fifth item in the options menu.
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Scroll down and tap the “Filter Unknown Senders” button 
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white. The switch will turn green
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. iPhone separates messages from non-contacts senders into a separate tab on the Messages app.
- On the Messages app, you’ll see new tabs at the top: Contacts & SMS and Unknown Senders . Messages going to the Unknown Senders tab will not show the message. [2] X Research Source
Advice
- Contact your carrier if you are being harassed. Harassment messages from unknown numbers will be blocked much more effectively if you contact your carrier as they have access to stronger blocking tools.
Warning
- Unfortunately, iOS does not allow us to block all messages except the accepted ones. You can only block specific contacts and phone numbers from texting you first.
- You cannot add numbers that are not in your contacts list or that have not yet contacted you to the blacklist.
X
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 19,019 times.
This wikiHow teaches you how to block text messages from unknown contacts or phone numbers. To block messages from unknown numbers, this number must have contacted you.
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