If you are collecting phone numbers on any form on your website, ensure that you have the following disclosure as a required checkbox on the form: 

By submitting this form and signing up for texts, you consent to receive appointment reminders, account notifications, and marketing text messages (e.g., promos, cart reminders) from [Company Name] at the number provided, including messages sent by autodialer. Consent is not a condition of purchase. Msg & data rates may apply. Msg frequency varies. Unsubscribe at any time by replying STOP or clicking the unsubscribe link (where available). Reply HELP for help. Privacy Policy [link] & Terms [link].

Be sure to update the brackets as needed.