You can top up credit on Viettel by using Thai Bank Transfer, Visa, Mastercard, JCB, Alipay, Cryptocurrency or your Coins.ph wallet. Easily bookmark your payments here: mobiletopup.com/topup/vietnam Reload any pre-paid phone on the Viettel in and cheap, fast and secure way. To check your own Viettel SIM number, dial: *098# To check your account balance, dial: *101# To check your data balance, dial: *102#