Hello @RochericaT3
Yes! Having a contact join your list via a text message is still very much a thing. Below I have provided the URL address to our Knowledge Base article which will walk you through on getting this set up within your account. If you have any questions along the way please feel free to call into support for further help.
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/6043-use-text-to-join
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