Softbank Corp has reported a 7% hike in sales to JPY3.2 trillion (USD39.5 billion) for the full year ending 31 March 2012, while net income soared 65% year-on-year to JPY313 billion. The operator said the gains were largely due to subscriber growth and strong sales of the iPhone 4S which was launched in October 2011. Softbank’s mobile unit recorded 3.5 million net additions during the year, bringing its total subscriber base to 28.9 million at the end of March. Monthly mobile ARPU slipped by JPY60 to JPY4,160 as gains in data ARPU failed to offset a JPY250 decline in voice ARPU. Meanwhile at Softbank’s broadband division the company saw its ADSL subscriber base decline by 549,000 to 2.6 million, and the number of fibre broadband subscribers grow by 676,000 to 1.6 million.