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telephone numbers: country code

The 1 in 800 and 900 numbers is the country code for North America. Therefore, if you are addressing a uniquely North American readership, there is no need to include the 1:

  • For more information, phone 800-555-5555.

If your documents are going to be read on other continents, you need to include the country code followed by a hyphen:

  • For more information, phone 1-800-555-5555.