The number of subscribers for 3G service has hit 29.1 million by June, up 29.6 percent year on year, news website ICTNews recently quoted the General Statistics Office of Vietnam as saying.
It was equal to around 32.1 percent of its population, which was much lower than many other countries where 3G penetration rates were 70-80 percent, the website reported.
Despite the rising of 3G, 2G remained popular in Vietnam with 107.8 million subscribers by June, up 6 percent from the same period last year, according to the report.
Vietnam's telecommunications sales increased 8.4 percent to VND177.8 trillion (US$8.14 billion), it said.
Since it was first available in the country in October 2009, the number of 3G subscribers has continuously surged.
The market is currently dominated by three telecom giants, namely VinaPhone, MobiFone and Viettel.
However, the companies have kept drawing public criticism with their alleged high prices for low-quality services, especially since 2013 when they doubled their rates to VND70,000 ($3.2) a month on average.
A recent report by the International Telecommunication Union under the United Nations showed that Vietnam's 3G tariffs was among the cheapest, news website VietNamNet reported.
It was equal to 44,3%-46,1% of the world average price, according to the report.