Review SMS promotional content

You mean submitting the short message content on the short message platform, and then clicking Send, but you can't submit it. If this is the case, it should be sensitive characters in the short message content. I suggest you work with your SMS provider to test which words can't be sent, and then modify them. If all these methods fail, I suggest you use onesmser SMS platform. Relatively speaking, operators report less sensitive words and more signatures, which is enough to send a lot.