In Spain it is very common answer "Diga" or "Dígame" and wait until the person calling you tell her name and what he wants. An informal private conversation might be: - "Diga". - "Hola, soy Antonio. "¿Eres Raquel?" - "No, soy su hermana, Almudena". Mi hermana acaba de salir... "Buenos días" is used in the morning, usually until lunch time (and this time is a bit variable as you know). "Buenas tardes" is used after lunch time (in the afternoon) "Buenas noches" in Spain is used normally when is dark since 9 or 10 p.m.

Una conversación normal: - Hola, con quien hablo? habla María, por favor, esta Raquel? - Buenos días, lo usamos desde que amanece, hasta las 12:00 meridiano, hora del almuerzo. - Buenas tardes, desde las 13:00 horas, hasta las 18:00 hours. - Buenas noches, desde las 18:00, hasta las 24:00 horas

buenas tardes is just for the afternoon so as soon as its 12:pm you use buenas tardes :) and when its late at night i dunno like around 8 , 9 pm or later you say buenas noches . well to my family they know me so I don't say my name i just say " Hola , buenas ...whatever time it is and then i say "como estas?".(how are you) if its a stranger I say " Hola , quien habla ? ( whos calling?) and then con quien quieres hablar ? (who do you wanna speak with ?) and if someone doesn't recognize me thats when i say what you wrote : Hola , es ...