M1 and Starhub stand the most vulnerable to TPG Telecom. Singapore's telco war is heating up as new mobile virtual network operators (MVNOs) are aggressively outdoing each other even before TPG rolls out its mobile services on a commercial basis, according to UOB Kay Hian. TPG Telecom's network deployment has progressed smoothly and is on track to launch as the city state's fourth mobile network operator by year-end.

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