Numbers

Q. Phone numbers. The US convention is sort of (Area Code) PRE-Number. International is all over the place. Any advice on presenting these in a consistent manner? In particular, I want to set a style rule for my company, which is US-based but has mostly international customers, so I want to include the country code as well. I’m leaning toward spaces separating the elements: +1 222 333 4567. Any thoughts?

A. CMOS has a section covering telephone numbers (9.59) that agrees with you on the use of spaces instead of hyphens for international numbers.

[This answer relies on the 18th edition of CMOS (2024) unless otherwise noted.]