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telephone number: 555.555.5555 (m)?

This is a hypothetical US number. Have you ever seen a US number formatted this way? When do you use it? And what's the (m) supposed to mean?

*I* was taught to write it (555) 555-5555. Is that outdated?

I would very much like to see links to the proper format.

1 Answer

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  • 8 years ago
    Favorite Answer

    It seems like an number used from computer or computer assisted and (M) is Mobile.

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