You can control your email, phone, and SMS notification from your notification settings. You can just uncheck the box if you do not want to receive notifications for that communication type. SMS notifications require a verified phone number. You may receive up to three messages per day and message rates may apply. Reply STOP to end.
You can also check the box at the bottom of the page to unsubscribe yourself from all Udacity email or SMS notifications.
Types of notifications
Payment Reminders - notification for payment reminders.
Learning Progress - due date reminders, check-ins and more to help you stay on track of my learning goals.
Alumni Services - messages with alumni services.
Project Reviews - feedback on your submitted projects
Marketing Communications - notifications about new courses and programs, scholarship opportunities and upcoming special events.