To automate a weekly SMS message to contacts who have a birthday that week, the Refresh Mobile Filtered List activity can be used to update the filtered list based on the birth date criteria. The Outbound Send activity can then be used to send the SMS message to the contacts in the filtered list. Reference: https://help.salesforce.com/s/articleView?id=sf.mc_moc_refresh_mobile_filtered_list.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.mc_moc_outbound_send.htm&type=5