NTT DoCoMo Inc. said Friday that its net profit fell 25.1 percent from the previous year to 457.3 billion yen in business 2006, due partly to increased sales promotion costs.

Japan's top mobile phone carrier, which boasts 54 percent of the 96.7 million mobile phone subscribers nationwide, said its operating profit also dropped 7.1 percent to 773.5 billion yen for the business year that ended on March 31.

Its sales rose 0.5 percent to 4.79 trillion yen.