Aiming to differentiate itself from its smartphone rivals, KDDI Corp. unveiled a new handset lineup Monday that features models compatible with the high-speed WiMAX network.

WiMAX is a high-speed communications network operated by KDDI affiliate UQ Communications Inc. Its capacity for uploading and downloading data is several times bigger than the 3G network, the cellphone industry's main network.

With the rapid spread of smartphones, the mobile Internet experience is becoming more popular in Japan. People with smartphones are on the Internet three times as much as their standard cellphone counterparts, said KDDI President Takashi Tanaka, citing recent research.