What is ViettelPay? Instructions for registering and using ViettelPay in the most detail

What is ViettelPay? Instructions for registering and using ViettelPay in the most detail. According to Viettel Group, then ViettelPay is an electronic payment ecosystem, also known as digital banking developed by Viettel, in which the main product is a mobile payment application that can be used on all types of phones, including mobile phones. universal mobile phone and smart mobile phones, helping subscribers when registering the service can make recharging, transferring money, paying utility bills, booking air tickets ... quickly and conveniently , easy, saves time, costs.