Constant Contact offers SMS services that enable organizations to communicate with their contacts via mobile devices. To receive messages from an organization that uses Constant Contact, you must opt in. The opt-in only allows the organization to contact you through the email address or phone number that you provided through the sign-up process. If you later try signing up with the same phone number or different email address, or different phone number and same email address, you can run into an error:
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If you're seeing this error message when you're trying to sign up for SMS communications, it means you already signed up using the same mobile phone number and a different email address. If you want to continue signing up with a different email address, there are two options:


If you're seeing this error message when trying to sign up for SMS communications, it means you've already signed up with the same email address but a different phone number. If you want to continue signing up with a different phone number, there are two options:

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