I am an existing Digi Postpaid 68 subscriber; can I sign up for the new Digi Postpaid Family plan as my Supplementary line?

Yes, however you are required to upgrade your existing Digi Postpaid 68 plan to Digi Postpaid 80 and above. Then you sign up for a supplementary line under the new Digi Postpaid Family plan i.e. Digi Postpaid 80 Family as your Supplementary line for only RM38/line monthly.