Can I Resend SMS Optin Message?
There is not an automated method to do this at this time. It is something we're looking at adding. However, It can be done by deleting a subscriber and readding them manually to the system.
If the SMS message was sent from a Local Phone Number versus a shared number; the system will listen for a response for two hours.
After the two hours, the system will stop listening for a reply.
You can to resend your email message to an opt-in for confirmation, just not the SMS.