You've all seen it, how different web sites and email signatures format their phone numbers. Some do 212-555-5555, some do (212) 555-5555, some do 212.555.5555, some do 212 555 5555, some do 212_555_5555 and the most annoying do 2125555555 and other variations.
Someone asked Google's John Mueller if it matters and can Google pick it up? John basically said Google can figure it out. He said to require sites that they must use a single format would be "futile" and thus doesn't make sense. So I suspect Google can figure out many types of phone number formats based on your preferred style.
John responded on Twitter saying "I imagine it's futile for any directory to require phone numbers with specific separators."
I imagine it's futile for any directory to require phone numbers with specific separators :)
— John ☆.o(≧▽≦)o.☆ (@JohnMu) July 10, 2018
Forum discussion at Twitter.