TrendCentral: Even more so than in the U.S., people in Japan are overwhelmingly addicted to text messaging, mainly because making private cell phone calls in public is considered extremely rude. However, overcrowded public spaces such as the subway are not always the most private, so it has become common practice to use stick-on cell phone privacy screens which are thin, tinted plastic screens (similar to iPod protectors) that make it impossible to read a cell phone screen from any angle but straight on.
Cell Phone Privacy Screens [TrendCentral]
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