After your Join By Text keyword has been created you will connect your keyword to your HupSpot account and list.
Join By Text is a service that lets people sign-up for your email list by sending a text message. This is especially effective for capturing email addresses at events, at a physical location, or as a call-to-action in traditional media ads (print, radio, TV, etc.) Your sign or ad copy would say something like “Text SIGNUP to 12345 and get a special offer when you join our email list!”
After someone sends a text message with their email address Join By Text automatically passes this email address into your HubSpot account and signs them up under the appropriate list. Whatever welcome or offer email you have configured for new subscribers will be sent to them (it works just like a signup on your website). You can connect different keywords to different email lists and change your keywords whenever you want.