The collapse of a merger between Singaporean mobile operators M1 and Simba is prolonging a fierce price war in the country's competitive telecommunications market.

The unravelling of a S$1.43 billion (US$1.12 billion) merger between Singapore mobile operators M1 and Simba has highlighted the city state’s brutally competitive telecoms market, revealing a potential regulatory minefield around scarce radio spectrum. The foiled deal would also mean Singapore’s mobile network operators – Singtel, StarHub, M1 and Simba – will continue to operate in a cutthroat price war environment while M1’s owners look for new ways to divest, according to experts. Singapore...