Softbank Corp. expects to gain market share from NTT DoCoMo Inc. and KDDI Corp. by focusing on small businesses.

The nation's third-biggest mobile phone company slashed fees in January to ¥980 a month, the cheapest in Japan, and offered unlimited calls to spur user growth. New corporate subscribers tripled to 220,000 in the first quarter to June 30, Softbank said.

"Japan's mobile market for business users isn't saturated yet," Katsuichi Tomita, senior executive vice president of wireless unit Softbank Mobile, said in an interview last month. "We are reinforcing our effort to attract corporate clients."