I'm having an issue with text messages failing. It's not every message. I recently signed up to have messages sent to me for tracking delivery of packages f and (as has always happened in the past) it requires a reply "yes" to activate. When i try to reply, i get a "failed" message. This has also happened with messages from other companies that I have tried to sign up for various messages from.
Any suggestions on how to allow these messages to go through? It worked in the past, so I'm thinking it must be a setting that has gotten changed somehow.
thanks!