Aiming to liberate users from a hassle of memorizing passwords, NTT Docomo Inc. said Tuesday it will increase its lineup of biometrics-deployed handsets and services because biometric technology for identity recognition will make mobile telephones more convenient.

"From now on, I think it will probably be necessary for online network services to be ready for biometric authentication . . . when users forget their passwords, it will be more convenient," Seiji Maruyama, senior vice president at Docomo, said during a news conference in Tokyo.

Earlier this month, Docomo introduced new handsets and four of them are programmed for biometric logins. While Samsung's Galaxy S6 and S6 edge and Sharp's Aquos Zeta recognize fingerprints, Fujitsu's Arrows NX reads a user's iris.