Only members with a Premium Plan can start a call. However, both, Free and Standard members can receive phone calls.
Accountable Calling is not automatically enabled on your account. In order to receive phone calls from your co-parent, you must turn on Recorded Calling, have a verified phone number saved to your account, and agree to the Accountable Calling Consent. You can update your calling preferences or upgrade your account, at any time, from your Account Settings.