In a saturated market for mobile phones, Japan's second-biggest mobile company, KDDI, has had success among older people with its Tu-ka phone, selling more than 100,000 subscriptions.

在饱和的移动电话市场，日本第二大移动通信公旬KDDI以其为老年人开发的Tu - Ka电话而大获成功，订购客户达到10多万。

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By contrast, Tu-ka phones are marketed on the strength of their simplicity; they look and work like traditional telephones.

相反，Tu - Ka电话的销售靠的是其简单；其外观和功能与传统电话相似。

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KDDI, has had success among older people with its Tu-ka phone, selling more than 100, 000 subscriptions.

ECONOMIST: The grey market