Ogilvy & Mather, DDB and incumbent JWT are expected to pitch, but sources have suggested that some agencies may pull out should the field grow too large.
S-Fone has pitched annually in recent years, and the business has always been retained by JWT.
The company is a joint venture between SPT and SLD Co., which was established in Singapore by Korea’s SK Telekom, LG and Vietnamese firm Dong Ah Elecomm.