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If the number you are going to use is long distance, dial 1, then the 10-digit phone number. For example: 14171234567
If it is a local number, dial 9, then the 710-digit phone number. For example: 9123456794171234567.
If you are dialing from an OTC phone to another OTC phone, you can dial the extension number. For example: 7548
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