[1] It is the trademark of S-Telecom (CDMA Mobile Phone Centre) (set up as a joint venture between Saigon Postel Corp. (SPT) and Korea SK Telecom).

[2] As of the start of 2005, breaking the old rule of the calls fee from 10 second to 1 second (6+1)7, S-Fone has 1,500,000 to 1,800,000 subscribers, contributing 3% to the total market (after Mobifone with 41%, Viettel Mobile with 34% and Vinaphone with 20%.

[3] Its market share (estimated based on revenues) fell to 0.1% by 2012 after suffering from a lack of capital, a small number of subscribers and low network quality.

[2][4] S-Fone ceased its operation, closed its stores and website, and released its staff from their contracts in July 2012.

On 9 October 2006, S-Fone officially launched CDMA 2000 1x EV-DO value added services for the first time in Vietnam: VOD/MOD (Video, TV on demand, music on demand) and mobile Internet (enabling internet access for PCs and laptops via S-Fone network) beginning in Ho Chi Minh City, Hanoi, Da Nang, Hai Phong and Can Tho.