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9 is often used to access an outside line on office telephone systems. It tells the system that you want to make an external phone call instead of just ringing another extension on the private system.

Without the '9', the system could not easily tell apart, for example, the internal extension number 200 and an external public phone number that started with 200.

011 is used as an international calling code in North America. Dialing it tells the phone network that you want to make an international call outside America, and then lets you dial the overseas number.

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15y ago

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