Question

The phone rings and the first thing you would say is..

A: Estoy bien. ¿Y tú?

B: Alo?

C: Hasta luego.

Answer 1

If the phon rings, the you would say;

B: Alo?

Answer 2

b)Alo? because a) is when some one ask how are you and b) is when you hang up hope this helps