I want to buy applecare for my new iphone 17 256GB which I bought yesterday
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[Edited by Moderator]
Go to Settings > General > AppleCare & Warranty, or visit https://agreementsales.apple.com/acsales/.
If you need additional support to add it, you would need to contact Apple. You can visit your local Apple Store, or call 1-800-MY-APPLE.