"I have called on the phone."

[valepika123]

"He llamado por teléfono" was not accepted :)

[Talca]

Well, that’s ridiculous. It should be accepted.

[elndon]

Agreed

[Margarette586611]

I had the same problem.......

[thrynae]

This occurs very often with duo, so I often report it

[Iris150201]

Why is the "the" omitted?

[Antonio844159]

I have the same question, why is "the" omitted?

[tallandtree]

The english sounds very odd in my dutch ears..

[thrynae]

*to my Dutch ears ;)

[Lewyboi]

Why "por" and not something like 'al' or 'en la'

[thrynae]

Because you are using the phone, and are not inside it or something. The use of 'on' in English is a little bit strange if you think about it, so it doesn't surprise me that Spanish doesn't have the same construction.

[angelnugroho]

"He llamado por teléfono" is now accepted!

[LaBiciEsMia]

Strange. I just used that and for me, it wasn't.