Please please please understand that your phone number does not look like this:
The use of periods in people’s phone number started during the Dot Com boom of 1999. People wanted their phone numbers to look more “internety”. By replacing the parenthesis and dashes with periods, your phone number resembles an IP address. But it isn’t.
It was a cute fad. But now more than ten years later, when you use dots in your phone number, you demonstrate that you do not know the difference between a phone number and IP address. It’s like writing the word “interweb” on your business card. It makes you look dumb.
The accepted ways of writing a phone number are:
(415) 555-1212 or 415-555-1212.
I prefer the latter because it uses fewer characters and the idea of an area code, the thing specified inside the parenthesis, isn’t important for many areas any more. In many urban areas there are overlapping area codes so you must dial all 10 digits. Simply put, a phone number used to be 7 digits long but now it is 10 digits long. But don’t be distracted by this last point. Just know: don’t use periods in your phone number. It makes you look like a Luddite.