1) How many cell phones are there per person in the world?
6/7 persons.
2) What are the differences in different countries? Can you comment some specific cases?
Russia, Germany, Brazil, Indonesia, United States and Japan have the most mobiles. China, Pakistan, Nigeria and India used little since there are have fewer resources. Russia for example is the biggest country.
3) What will happen in the future?
In the future the mobile phones will be more advanced.
4) How is it that we can speak on a mobile phone without hearing other conversations from other people?
Because each subscription have one number.
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