Mobile app: -
Compare with
Fiat Crypto Exchange in Vietnam
Update: It seems like the CoinMex exchange shut down, possibly exit scammed. CoinMex provides access to BTC, ETH, USDT and NEO markets. The company was incorporated under the legislation of the Republic of Seychelles in 2018 and is affiliated with NEWEX Technology Co. Ltd. CoinMex is focused on the Chinese market. 
Actionable digital currency trading platform.