You’re not? No, I’m not.

From Twitter:

From Twitter
Look:
A: You’re not going?
B: No; I’m not. I have to wash my hair.

C: Is it Thursday?
D: No, it’s Friday.

E: Are you hungry?
F: No.
E: Really? You’re not?
F: No. I’m not.

Try:
G: Are you happy, now?
H: No.
G: You’re not happy?
H: __, I’m not; the food is terrible.

*Yes
*No

Answer and Explanation:
The answer is ‘No,’ because we do not confirm a negative (for example, I don’t, it isn’t, we won’t, it doesn’t) with a positive (like affirmative, yes, uh huh).

Pick Up The Phoneの使い分け(字幕付き)

How do we talk about answering the phone? Well we don’t say:
I’m sorry; I didn’t get your phone.
No one wants you to get(take) his or her phone; get your own phone. (Ha ha.)
However, “get the phone” means “answer the phone (because it is ringing).

Unlike in Japanese, in English, phone and phone call are two different things, conversation-wise, so–we say:

I’m sorry I missed your call.