1) How many cell phones are there per person in the world?
roughly 1 per person.
2) What are the differences in different countries? Can you comment some specific cases?
There are some that have over 100% and others that have less. Russia for example has 160% and India 73.1%
3) What will happen in the future?
That there will be more phones than people in the world.
4) How is it that we can speak on a mobile phone without hearing other conversations from other people?
Because of technology innovations, using different methods.
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