Be on the telephone
verb
To be using the phone for a conversation.
I'll be on the telephone the whole morning, discussing the project with our partners.

Often appears as...
- be on the telephone with
- be on the telephone for
verb
To be waiting for a phone call or about to make one.
I'll be on the telephone all night if I have to, waiting for him to call.

Often appears as...
- be on the telephone all day
- be on the telephone all night
verb
To be engaged in communication via telephone, especially for a long period of time.
She's been on the telephone for hours, trying to resolve the issue.

Often appears as...
- be on the telephone for hours
- be on the telephone all day
verb
To be using the phone for a conversation.
I'll be on the telephone the whole morning, discussing the project with our partners.

Often appears as...
- be on the telephone with
- be on the telephone for
verb
To be waiting for a phone call or about to make one.
I'll be on the telephone all night if I have to, waiting for him to call.

Often appears as...
- be on the telephone all day
- be on the telephone all night
verb
To be engaged in communication via telephone, especially for a long period of time.
She's been on the telephone for hours, trying to resolve the issue.

Often appears as...
- be on the telephone for hours
- be on the telephone all day
Definition 1 of 3

Business Context
Indicates busy schedule, often in professional settings where discussions are planned.

Can't meet for lunch, I'll be on the telephone with clients.
Scheduled Calls
Used when referring to calls that are part of a planned agenda or timetable.

He's unavailable every Tuesday because he's on the telephone for team briefings.
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