NTT DoCoMo Inc. said Thursday its operating profit for the fiscal first half fell 7.8 percent due to the heavy cost of incentives paid to handset vendors.

Operating profit for the April-September period stood at 590.11 billion yen, while revenue rose 6.4 percent to 2.54 trillion yen.

Net profit soared to a record 356.43 billion yen, compared with 4.17 billion yen during the same period a year ago, when the company took a hefty one-time charge to write down overseas investments.