Textra won't allow responses to certain kinds of texts. For ex, when Duke Energy texts to ask if power is back on & tells me to text back yes or no, Textra gives a message not sent error. This is similar to, for ex, an invitation I heard on a podcast to "text the word podcast to 66866 to get a listener survey." The text supposedly sends but I don't get a reply. When Textra adds a country code of 1 before the number those texts still don't receive replies, which means they aren't being received.