How to add extension phone call

- How to add extension call
- How to add extension when calling
- How to add extension to phone call iphone
- How to add an extension number to a phone call
- How to add extension when calling on iphone
- How to add extension when calling someone
- How to add extension before calling
- How to add an extension when making a phone call
- How do you add an extension to a phone call
- How do i add an extension to a phone call