iPhone 13 pro AppleCare

Did you receive your new iPhone 13?

You have 60 days (from the date of purchase) to subscribe to an AppleCare Plus Protection plan.

See also this support page:--> https://support.apple.com/en-us/HT202702

If you're talking about the standard 1 year warranty and standard AppleCare, you do not need to make anything.

Regards

Giulio

If you are unable to do through the phone, call Apple directly at 800-MY-APPLE and ask for AppleCare Plan Administration. They can set you up with a plan. This is IF you are in the US.