Manner Mode (マナーモード - Manā Mōdo / Silent)
The unique Japanese term for 'Silent/Vibrate Mode' on smartphones. In Japan, it is an absolute social expectation to keep your phone on Manner Mode and completely refrain from voice calls while inside train carriages.
Coined by Japanese cellular carriers in the 1990s as a friendly campaign promoting public etiquette. It aimed to stop ringtones from breaking the peaceful quiet of enclosed trains, preventing commute stress.
Before stepping onto the train, toggle your phone to silent/vibrate mode. Keep your phone call-free. If you must answer a call, wait until the next stop to step off onto the platform.
What is the absolute rule regarding phone 'Manner Mode' inside Japanese trains?