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Why iPhone can not stop unknown persons and the unknown number to send you the text message
iPhone 6s Plus, iOS 13
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Yes you have.
Filter iMessages from unknown senders
You can filter iMessages from people who aren't saved in your Contacts.
To filter iMessages, go to Settings > Messages and turn on Filter Unknown Senders.
In Messages, you'll see a new tab for Unknown Senders but you won't get notifications for these iMessages.
For SMS and MMS contact your Carrier (Cellular Service Provider) The agency who issued the SIM to you