NTT DoCoMo Inc. said Wednesday that it might sell its 16 percent stake in AT&T Wireless following an agreement by Cingular Wireless LLC to purchase the No. 3 mobile carrier in the United States.

Cingular said Tuesday it will acquire AT&T Wireless for $41 billion, or $15 per share. NTT DoCoMo's 16 percent stake is worth about $6.5 billion (about 690 billion yen).

"We were informed that Cingular agreed to buy AT&T Wireless, and we will consider options to maximize shareholder value," NTT DoCoMo spokesman Susumu Takeuchi said.