Let customers sign up for your SMS messages themselves

By using a Sign up solution, your contact list is always up to date. Phone numbers are added and removed directly by the customer, who can now control whether they want your mailings or not.

Sign Up is effectively used when you want to let people self-select that they want to receive information from you, for example if you have a customer club. Your customers can text in to sign up for your SMS mailings. They can just as easily text to unsubscribe.