Singapore’s third MNO, M1, may be up for sale, as the island state sees its mobile industry falling into a familiar global pattern – a fourth operator enters the market, prompting price wars and consolidation. China Mobile is reported to be one of the interested parties. In Singapore, the new entrant, TPG, has not even launched commercial services yet. But M1 and its rivals StarHub and SingTel are bracing themselves for the entry of a fourth competitor and the likely changes this will prompt in pricing and costs. TPG is a fixed broadband operator in Australia and recently acquired spectrum there too, so it will be hoping to be a disruptive fourth player in two countries, though it has denied…