You dialed a 4 instead of a 5.
You identify yourself to the other person.
There's an interruption while you're on the phone.
You want to talk to a different person.
The person the caller wants to speak isn't there.
You can't hear the person very well.
This is Kathy Marks.
We have a bad connection. Call me back.
Just a minute.
Can i take a message.
Could I speak to John please?
I'm sorry i have the wrong number.