"This short girl is talking on the telephone."

Translation: Ez az alacsony lány telefonon beszél.

[AtalinaDove]

Can you not say "a telefonon" in this sentence?

[vvsey]

If you are talking about a specific telephone. But normally, unlike in English, you don't say "a telefonon".

[Bjermann]

What is the difference between ez az and ez ott? Thanks!