Whats a linked phone number?

When you sign up for Chalkboard or invite your team, you'll be asked to provide a physical mobile number which we use to send a verification code and associate with your user profile. (i.e. not a VoIP or virtual number, but a number provided by your phone network and tied to the SIM card of a phone).

If you need to change this number once your account is active, you can do this via your user profile.