Why there is no signal in subway?

“While tunnels are probably the most obvious obstacle to achieving line of sight, mobile signals are also blocked by mountains, trees, buildings, etc.,” says Val. Even the train itself can block mobile signals, because they are essentially big metal tubes traveling at incredibly high speeds.



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Talking loudly on trains is considered bad mannered and ranks highly amongst the most annoying behaviors on trains in Japan. Don't talk on the phone. Only on long-distance trains on the decks between cars is talking on the phone acceptable. Set your phone to silent mode.

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Your mobile phone must be able to display the ticket on your phone screen. If your phone battery has died, you will be unable to retrieve your mobile ticket. Therefore, you will have to purchase a new ticket for the journey you wish to make.

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