How many cell phones are there per person in the world?
6/7 because in the world are 7 billions and 6 billions mobile subscriptions.
What are the differences in different countries? Can you comment some specific cases?
Russia for example is the highest and gremany. I think the most developed countries have the highest rate.
What will happen in the future?
In the future the number of the mobiles subscriptions will rise.
How is it that we can speak on a mobile phone without hearing other conversations from other people?
because each subscription have a number and all the people have to share the air.
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