Silence unknown texters

Filter iMessage messages from unknown senders

Filtering messages from unknown senders turns off iMessage notifications from senders who aren’t in your contacts and sorts the messages into the Unknown Senders tab in the Messages list.

1. Go to Settings  > Messages.
2. Turn on Filter Unknown Senders.
3. Note: You canʼt open any links in a message from an unknown sender until you add the sender to your contacts or reply to the message.

You can go to Settings>Messages and set Filter Unknown Senders. However, I'm not sure if that disables the notification. If these are text messages and not iMessage, you can contact your carrier to see what they have for blocking spam texts.

Are these SMS messages versus iMessage? If they are, what does the carrier provide for spam text messages? With my carrier (AT&T) I very rarely see a spam text. Maybe one every couple of months.