The "Message Blocking Is Active" SMS error on your phone appears for various reasons. Perhaps you mistyped the number; other reasons like a blocked number or a SIM card issue could lead to the error.
6 Fixes for the "Message Blocking Is Active" SMS Error
MakeUseOf » iOS
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It's ultra-frustrating when your SMS won't send, but there are some handy quick fixes you can try to resolve the error.
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