I'm not quite sure what your question is. SMS does not use data at all. It uses the cellular voice channel. If you don't have either a Wi-Fi connection or a cellular data connection then the phone can't send iMessages, and all messages will go as SMS.
WiFi iMessage but there’s a block is active it won’t send as iMessage but as text even when I’m only using WiFi
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while im useing wifi to imessage other iphkne users when i tap send therea a notification that said msg blocking is active ? and it wont imessage how do i get it to imessage and not text