Standard format for phone numbers?

Question

I've recently noticed a wider variety in how phone numbers are presented, both in print and online, specifically with regard to spacing & punctuation.Examples: [phone] [phone] [phone] [phone] 1.555.123.4567 555.123.4567 555-123-4567 (possibly others)Is there a single, standardized or generally recommended format for publishing phone numbers? If so what is it?Or is it really anything goes these days?

Answer 1

In the United States, the format is the three digit area code followed by the seven digit subscriber number, each separated by a dash: 555-123-4567.