How Do Phone Extensions Work? Extensions are basically numbers which stretch from your business number. Generally, extensions tend to be four-digit numbers. In MightyCall, extensions can be made up of different numbers of digits, so if you want someone to have extension 2 or 11 or 942, that's possible.

How do you use extensions on the phone?

After dialing the main number, press and hold# to add a semicolon ( ; ). Enter the extension number after the semicolon , and then tap the call button.

What does extension mean for phone numbers?

What is a Phone Extension? An extension is a three to six-digit number identifying a specific call path configuration that allows you to dial and connect to another caller internally. This is not a DID phone number but rather an internal extension.