Japan’s second largest mobile operator KDDI yesterday stopped accepting new mobile phone orders after a surge of calls caused a glitch in its computer system, a company official said. The cellco is reaping the benefits of the new mobile number portability (MNP) regime, which came into effect in October, but admitted that demand had overloaded its system. The au computer service that handles order processing slowed to a crawl at 4pm local time and stopped taking orders. Although it resumed soon after, it crashed again at 5pm. Since MNP was introduced in Japan, the country’s leading mobile operator by subscribers NTT DoCoMo has lost some 238,000 customers, while SoftBank Mobile (formerly Vodafone KK) has lost 78,000 users. KDDI meanwhile has increased its subscriber base by 316,000.