Nissan Motor Co. announced Monday that it will sell all its shares in nine Tu-Ka and Digital Tu-Ka cellular phone companies to DDI Corp. and Japan Telecom Co. in a move that will likely accelerate the ongoing realignment of cellular phone operators into three major groups -- DDI, Japan Telecom and NTT Mobile Communications Network Inc., known as NTT DoCoMo.

The sale will allow DDI and Japan Telecom to spread their cellular networks across the nation, which should allow them to better compete against NTT DoCoMo.

Nissan, in turn, hopes to focus its resources on its core business: automobile production and sales.