To forestall Microsoft Corp.'s attempt to dominate cellphone operating systems as well as lower handset prices, NTT DoCoMo Inc. plans to adopt an OS based on the open source Linux software, sources said.

The company is already in talks with handset manufacturers to develop the system and aims to market its first Linux-based cellphone-a third-generation (3G) model based on its Foma platform-in the autumn of 2004.
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