56. Is China the only country that uses 11-digit mobile phone numbers in the world?

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　　57. What can we know from the fourth to the seventh digits of a mobile phone number in China?

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　　58. Why does China use 11 digits for mobile phone numbers?

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　　59. When can a mobile phone number be recycled in China?

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　　60. Which country perhaps has the shortest mobile phone numbers in the world?

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