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Block messages from a specific person or number

1. In a Messages conversation, tap the name or number at the top of the conversation.

2. Scroll down, then tap Block this Caller.

To view and manage your list of blocked contacts and phone numbers, go to Settings  > Messages > Blocked Contacts. See the Apple Support article Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch.

https://support.apple.com/guide/iphone/block-filter-and-report-messages-iph203ab0be4/ios