I want to add a apple care to my phone

Hello~ You can try this :

Buy an AppleCare plan - Apple Support

Your iPhone may not be illegible.

~Katana-San~

If you purchased your iPhone within the last 60 days:

AppleCare Products - iPhone - Apple

Has it been 60 days or less since you bought the phone?

Buy an AppleCare plan - Apple Support (CA)

elviana16 wrote:

I got it on December 202[?]

Regardless which year you mean, it’s too late to purchase AppleCare (>60 days).