Hello @L72411 ,
The primary elements you'll need are the phone numbers and their consent date. This is an important compliance element, and will need to be included with the imports.
I'd recommend checking out our SMS Permission Policy, as well as these articles for more info:
Import a list of SMS-only contacts
Guidelines for using SMS marketing through Constant Contact
Additionally, you may wish to speak with our Review team to make sure everything is good on your side for the SMS consent collection and contact uploads.
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