Provide a Usable Phone Number (M2)

Some students don't respond to feedback, even when we've tried to make it obvious. Provide a phone number that can receive texts and/or voice messages. Any call or text comes from the teacher or a TA, who will identify themselves and the class — it won't be spam.

Submitting

What gets checked: the submission contains a number in the 123/123-1234 format.