My phone has been stolen. How do I get a replacement if I have apple care?

If you purchased AppleCare+ with Theft and Loss coverage, that covers theft and loss.

AppleCare+ with Theft and Loss coverage requires you to have Find My iPhone enabled on your device at the time it is lost or stolen.5 See AppleCare+ Terms and Conditions or AppleCare+ with Theft and Loss Insurance Documents for complete product details. Certain exclusions apply.

Other AppleCare plans do not cover theft and loss.

Info:

AppleCare Products - iPhone - Apple

If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Do you have Apple Care+ with Theft and Loss, if not you do not get a replace,meant.

AppleCare+ with Theft and Loss includes up to two incidents of accidental damage, theft, or loss coverage every 24 months.3Each incident is subject to the deductibles listed below. In addition, you’ll get Express Replacement Service4 and 24/7 priority access to Apple experts by chat or phone.* 

• Theft and loss coverage requires you to have Find My iPhone enabled on your device at the time it is lost or stolen.