Yes, the parents can sign up to their Child's class using their phone number. This can be possible if - The teacher provides the parent with a Class Access Code and the instructions to sign up via phone number. The teacher invites you via phone numberMore Help -How to Sign in to Bloomz app with my Phone number? What to expect when my Child's Teacher adds my phone number to her class? How can I change my phone number associated with my Bloomz account? I am receiving TEXTS from my class teacher, how do I reply back?How to stop getting TEXT notifications?