Softbank Mobile Corp. President Masayoshi Son said recently on Twitter the company will consider a flat-rate unlimited mail and Web service for people taking its mobile gadgets overseas, responding to customer complaints that network fees are expensive when they go outside Japan.

Son, known as an aggressive entrepreneur and an active Twitter user, responded to a user's comment Sunday that it would be nice if Apple Inc.'s iPhone and iPad, for which Softbank provides mobile services in Japan, could be used overseas for an unlimited flat rate.

"We'll do it. (We'll) start with some major countries," Son replied.