Organizations have the ability to signup to send SMS messages to Guests. If this is a feature you're interested in please reach out to your Implementation Manager/CSM.
When a Guest Opts In to receive SMS messages they have the option to receive assistance about SMS messages. There are several responses a Guest can respond with for help with SMS, these responses are mandatory to comply with CTIA guidelines for US short code programs.
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To see the START/Subscribe Responses review the article below:
To see the STOP/Unsubscribe Responses review the article below:
To confirm a Guest has been unsubscribed from SMS messages review the article below:
How can I identify if a Guest is subscribed to receive SMS messages?