What does it mean when number is busy

- What does it mean when user is busy
- What does it mean when call is busy
- What does it mean when user is busy on iphone
- What does it mean when someone's number is busy
- What does it mean when fax number is busy
- What does it mean when a number is busy or not reachable
- What does it mean when a phone number is busy
- What does it mean when it says number is busy
- What does it mean the number is busy now
- What does it mean if number is busy
- What does it mean when a number is always busy