Sony Ericsson will soon complete the worldwide roll-out of Walkman-brand cell phones with the launch of its first model for Japan, it said Monday. English US Edition. Edition; English UK; ...

Sony Ericsson also released the W890i Walkman handset and the K660 Cybershot model. Both are quad-band (GSM 850/900/1800/1900) world phones, but the W890i is optimized for European 3G networks.

Sony Ericsson Mobile will launch late Thursday six new phones, including a high-end Walkman-branded handset with around 9GB of internal Flash memory.

Microsoft Corp sued Kyocera Corp for patent infringement on Friday, alleging the Japanese company's Duraforce, Hydro and Brigadier cell phone lines violate seven Microsoft patents.