"Who is this?" is a phrase which is often translated as "¿Quién es?", and "hello" is an interjection which is often translated as "hola". Learn more about the difference between "Who is this?" and "hello" below.
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An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g. Wow!).
2. (used to answer the telephone)
Hello. Who is calling?Sí. ¿Quién es?
Hello. - Hi, it's Ricardo.Hola. - Hola, soy Ricardo.
Regionalism used in Spain
Hello. - Hi. Is Maria there?Diga. - Hola. ¿Se encuentra María?
d. aló (Southern Cone)
Hello. Who is this?Aló. ¿Quién es?
Regionalism used in Mexico
Hello? I can't hear you.¿Bueno? No te escucho.