How about some hyphens?

[TimW]

Then Google and/or Firefox have got the formatting wrong as well. The official format for US phone numbers is (nnn) 555-1212, and if we're going to have formatted numbers, could we please have the correct format (sorry, pet peeve).

Using Chrome (the browser shouldn't matter as much as the search engine), I Googled several phone numbers, and all of them came back with the same results regardless of the phone number format that I used. Google even corrected the format when I used a 10-digit (not 9-number) string.

[digger16309]

Then Google and/or Firefox have got the formatting wrong as well. The official format for US phone numbers is (nnn) 555-1212, and if we're going to have formatted numbers, could we please have the correct format (sorry, pet peeve).

Agreed, either way will work. It's just a pain at the moment to do the search, then manually go into the Google search box and add hyphens, or (nnn) as the case may be.

[lost_]

The official format for US phone numbers is (nnn) 555-1212

I actually couldn't find any documentation that says the "(NPA)NXX-NUMB" is the official US formatting (with regards to delimiters). NANPA documents, etc.. does anyone know? I thought it's just one of the acceptable formats, but the official North American numbering is just NPA-NXX-1234 without specifying the 'official' way to format it. I might be mistaken.

I use periods, like most of the rest of world.

Hmmm.. says who? I know many countries who don't use periods. The international number format is "+(country code) (number)"

With that, I vote for hypens/dashes NPA-NXX-1234. It's more space efficient than (NPA)NXX-1234