Would you like to talk on your cellphone when you are in public transport?

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In Hong Kong many people like to talk on their cellphone when travelling on a public transport,like trains, buses, minibuses and ferry, etc. As the environment is too noisy and usually crowded when in public transport, they need to speak loud. Everyone around him/her would have no doubt hear what he/she is saying, like it or not. It is sometimes quite disturbing and annoying, too. In Japan, people do not usually talk on the cellphone on trains or public transports. It is because they are taught to not doing so. They know that if there are upto 7 persons in a compartment of a train talking on the cellphone, the radiation is already too high and cannot be afforded by human brains. That means it harms our brain. Not just the one who is talking on the phone but everyone in that compartment gets hurt. What is your opinion? Do your people also like talking on cellphone in public transport? How do you feel about it? Looking forward to hearing your sharing.