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Exclamation mark next to text message?

True, but not always the case.
I was getting the failed message yesterday (the exclamation point next to the sent txt) and they were still going through..
Strange

The trigger for the failure is not time sensitive, it is signal strength sensitive, and that varies in micro-seconds.

Unfortunately it is not a perfect system and as far as I know the user cannot turn that feature off. At least the "message failed to be sent" prompt does not come up unless a receiving tower is not found (an outage). Sometimes even those failures self correct and the sender will inadvertently send a duplicate message.
 
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