International and Torpedo Ideas to compete with local agencies BassaOrchid, Adfocus, Reddot and Addon.
Naga DDB is believed to have been invited, but declined to pitch because of conflict with Digi.
The brief is to build TMI's Cambodian brand platform "Hello" and gain ground on the country's market leading telco operators. Hello is Cambodia's third largest mobile telco, with 269,000 subscribers.
The news follows Telekom Malaysia's announcement yesterday (December 9th) that the company will demerge its domestic and foreign mobile businesses and house them within TMI.