Do Promo code work for postpaid bill payments? True Balance Customer Support April 06, 2020 10:17 Updated Follow Yes, promo codes are applicable to postpaid bill payments. Related articles Is there any payable limit on postpaid bills? Can I pay my postpaid bill on True Balance? Do I have an option of prepayment/foreclosure of my loan? My recharge keeps getting 'Failed' Comments 0 comments Please sign in to leave a comment.