Mr. Hung Nguyen presented on the vital role of telco billing in Vietnam's growing gaming market. Telco billing accounts for 85% of payments in Vietnam due to the popularity of cash-based transactions and telco networks' unparalleled distribution reach. Common telco billing options include premium SMS, prepaid cards, and mobile wallets, each with advantages and disadvantages for payers and publishers. Emerging trends may reduce telco billing's dominance as banking services, telco-owned payment gateways, and proprietary app stores expand.