How can I renew my warranty on my iPhone?

Greetings carltwin,

Welcome to Apple Support Communities. We're glad you're here. It will be our pleasure to share some details about your warranty and the options available to you.

• Tap here to Check Your Service and Support Coverage
• Open this link to view the Apple Hardware Warranties
• Follow this link to view AppleCare Products and tap here to Buy an AppleCare plan

Scroll down to Learn More in the last link to read:

• • "In most countries and regions, you can buy AppleCare+ within 60 days of your device purchase. In Japan, you can buy AppleCare+ within 30 days of your device purchase."
  • "In some countries and regions, you can buy an AppleCare Protection Plan within 1 year of your purchase of an eligible Mac, Apple TV, or other device."
  • Note: "Apple's Limited Warranty and AppleCare plan benefits are in addition to your consumer law rights. Not all products and buying options are available in all countries or regions."

You'll find additional tips in each link to guide you.

Have a wonderful weekend!

Assuming you are referring to extending a currently active AppleCare+ plan, you may find the following article helpful:

• Extend your AppleCare+ coverage - Apple Support