The Japanese unit of wireless giant Vodafone Group PLC said Monday it has named Shiro Tsuda, former No. 2 officer at rival NTT DoCoMo Inc., as its president and CEO.

The surprise announcement came only a few months after Tsuda, then DoCoMo's senior executive vice president and considered heir apparent to DoCoMo President Keiji Tachikawa, was passed over for the top job.

"I was moved by Vodafone management's passion for mobile communications," Tsuda told reporters in Tokyo in announcing the appointment.