SINGAPORE -- Singapore telecommunications company Singtel will face the challenge of making its 5G business viable under new leadership just as the city-state rolls out the next-generation mobile network. But the rise of rivals and the coronavirus pandemic are chipping away at the company's standing. Singapore will begin introducing 5G services in January, aiming to cover the entire country by the end of 2025. Singtel, Southeast Asia's largest telecom operator by market capitalization, has one of the two licenses for the new network in Singapore, with local rivals StarHub and M1 jointly holding the other.