Directory Numbers

+1 (312) 421-XXXX

Here are the components:

Country Code: +1 (both the USA and Canada share the same country code).

Area Code: A 3-digit code that designates a specific geographic area or region.

Prefix: A 3-digit code that narrows the location within the area covered by the area code.

Line Number: A 4-digit number unique to the individual or business within that prefix.