I've been having this issue since I got my S7. When in connected to wi-fi, wi-fi calling enabled and sending texts I sometimes get error messages like the text didn't send but in most cases it actually goes out. I end up resending the message not knowing whether or not the recipient actually got it. It's not predictable at all. Sometimes the message goes out fine over wi-fi. Other times it gives me the !(bang) but I still never know whether it sent through or not unless I get a reply from the other party right away that is a direct response to that particular text. If not I usually disconnect from wi-fi and send it again. It's just a pain and the recipient ends up getting double texts.

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