Hello @GABRIELLAD93 ,
Your sign up form is not setup to accept SMS numbers. Please see our article on including SMS opt-in for landing pages if you need step-by-step and visual guidance on this.
Importing SMS contacts is different that just importing regular email contacts with a phone number included. If you need information on getting started with SMS, and what's necessary for the sake of permissions compliance, I'd honestly recommend referring to this Community post for links to the most pertinent articles.
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