Meaning of the word "on the phone" in English

What does "on the phone" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

on the phone

US /ɑːn ðə foʊn/
UK /ɒn ðə fəʊn/
"on the phone" picture

Phrase

speaking to someone using a telephone

Example:
She was on the phone for an hour with her sister.
I can't talk right now, I'm on the phone.