I have subscribed to biGBonus RM35 (without bundled Unlimited Calls), how do I get the Unlimited Calls?

You can purchase the add-on of Unlimited Calls via MyDigi > Buy Add-ons> Booster > or by dialling *116# and look for 'Quota Top Up'. The add-on of Unlimited Calls is an one-off purchase which valid for 30 days. Upon the expiry of the pass, your call will be charged based on your rate plan tariff.