Japan’s largest mobile operator by subscribers, NTT DoCoMo, booked a 3.5% fall in net income for its fiscal first quarter ended 30 June 2010, as revenues from data-based services failed to fully offset a decline in voice telephony traffic. DoCoMo’s net profit fell to JPY142.15 billion (USD1.63 billion) in the three months to 30 June 2010, down from JPY147.40 billion in the same period a year ago. The company kept its full-year earnings outlook unchanged though. Operating profits declined 4.5% year-on-year it said, to JPY240.5 billion, although quarterly revenues rallied 0.4% to JPY1.09 trillion. DoCoMo, which has started selling Android-loaded smartphones, added a net 432,300 new mobile users in April-June, falling short of the 695,600 new sign-ups captured by rival Softbank Mobile. The country’s second largest cellco by users, KDDI (au Corp), lagged a distant third with 219,100 net new subscribers.