We have a group conversation (of 3 friends) on phone, after some time one of us was 'cut off' / 'hanged up' of the conversation. Which of them is more intended for unexpected or non-wished such ending of conversation?
For example, when he calls again to join our conversation, I can tell him:
We didn't notice that you got cut off the call / hanged up.
He may response:
Yes, I'm sorry that the call was cut off / hanged up.