NTT DoCoMo Inc. said Tuesday it paid some $9.8 billion, or about 1.10 trillion yen, to AT&T Wireless Group of the United States to acquire a 16 percent stake in the AT&T Corp. mobile phone service unit.
The two mobile phone operators concluded the deal last December.
NTT DoCoMo is the cellphone unit of telecom giant Nippon Telegraph and Telephone Corp. It aims to expand its popular i-mode Internet-cable phone service in the U.S., it said.
It will also provide AT&T Wireless with its wide-band code division multiple access technology for use in third-generation mobile phones, it said.