One Seg

One Seg uses one segment (of 13) from digital terrestrial TV broadcast bandwidth for mobile device viewing. Launched April 2006, it enabled real-time TV on feature phones and car navigation systems.

Quality is QVGA (320x240 pixels), lower than full-seg (home TV) but designed for stable mobile reception. Viewing is free, though NHK reception contracts apply (2019 Supreme Court ruled One Seg phones require contracts).

One Seg symbolized Japan's feature phone culture. Watching TV on commuter trains was a common 2000s scene. Smartphone adoption and streaming services (YouTube, Netflix) rapidly displaced One Seg usage.

Most current smartphones lack One Seg. However, it retains disaster preparedness value - TV broadcasts are receivable without internet as long as signals reach. See telephone evolution for feature phone multifunctionality.

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A colloquial term for pre-smartphone flip phones that evolved uniquely in Japan, nicknamed 'Galapagos phones.'

NTT Docomo's 1999 mobile internet service for feature phones, a pioneer of pre-smartphone mobile internet.

A Japan-originated mobile payment technology using FeliCa chips, enabling contactless payment and authentication by holding the phone near a reader.

A mobile phone combining a feature phone's physical button design with Android OS, offering smartphone capabilities in a traditional form factor.

NTT Docomo's emergency alert service that broadcasts earthquake warnings and tsunami alerts to all devices in the affected area.

Wangiri (One-Ring Call)

A technique of ringing once and hanging up to lure a callback. Common in international phone fraud.

From the Black Rotary Phone to the Smartphone - 130 Years of Telephone Evolution How to Make Phone Calls During Disasters - Using the 171 Message Dial Phone Numbers That Vanished from Japan - The End of Pagers, PHS, and Dial Q2

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