Hello or Hi ?

Hello students! Hi students! what's the difference.

Nothing really.

A lot of people answer the phone with "What's up" or just say their name, or "Smith residence" or something. I consider "What's up" a little abrupt. When I answer the phone, I say "Hello?" like most people. I rarely say "Hi" in real life, preferring the greeting "Hey."

I think Hey and Hi as a greeting are really the same word. In all the Germanic languages I know you have this H+diphthong greeting.

Some people answer the phone with ´YES´.

That's considered rude though innit squire?

according to the Oxford Dictionary :
Hi, (informal) is an interjection used as a greeting like Hi there !
British : Hey.
Do British use hey ? I've never heard.

Ahoy was a cry used by sailors attract attention. Ahoy there ! Land/ship ahoy !

Simon
what do you mean by "innit squir" ?

German greet with "Hallo" with a guttural "H".

Some people answer the phone with "good morning", "good afternoon", ...etc. especially when you call offices, shops, business...etc ? I rarely heard my American friends answer the phone in the evening with "good evening". Maybe I'm wrong.

You can answer the phone with "Hi" if you have caller ID and know that it is a friend of yours that is calling you up. Hi is basically the familiar form of Hello, which is more formal. It's like the difference between using tu and vous in French, except the standards aren't so strict. I say "hi" to professors I know in the hallway.

I am learning English, and I want to practice the pronunciation with someone who can help me how to get a good pronuntiation. I want to pronounce well the words, because there are a lot of jobs waitning for me.
I am a professional, and I know trhat if I learn how to speak fluently I am going to find an excellent job. I am waiting for your support in teach me in English.

What would happen if someone answered the phone with ''darn'' or ''shit'' or ''fuck''?

Why don't you try it and see what happens?