Pink lines appeared on screen when I clicked to update iOS 18.0.1 on my iPhone 13

Who did you buy the phone from? You can check your warranty coverage, by opening the Settings app > General > About, where you'll see if the phone is still covered by warranty. If the phone is still eligible for warranty support, assuming the phone has never been tampered with, you can take it to your Apple Store Genius Bar and show it to them. If the phone is not eligible for warranty support, repairs, if any are needed, will be your expense.

If you’re experiencing pink lines on your iPhone 13 screen when attempting to update, it could be due to a software glitch, but there’s also a chance it’s a hardware issue. Here’s what you can consider doing next:

1. Evaluate the Current Software Version: If your phone is on an older version of iOS, some heating issues or glitches could be due to system instability, which updates often aim to resolve. However, since you've encountered glitches with the new update, proceeding cautiously is wise.
2. Restart and Try Again: If the pink lines only appeared during the update process and aren’t there now, it’s possible it was a temporary glitch. Try restarting your phone before attempting another update. This might help refresh the system and stabilize any temporary bugs.
3. Try Updating via iTunes/Finder: Instead of updating over Wi-Fi, try using a computer. Connect your iPhone to a computer with iTunes (or Finder on macOS Catalina and later) and update it there. This method can sometimes be more stable, especially if Wi-Fi interruptions are causing issues.
4. Check Apple Warranty: If the pink lines reappear after updating, Apple warranty should cover the issue if it’s related to a hardware defect. Apple’s limited warranty covers defects that occur within the first year (or two years with AppleCare+). If this turns out to be a hardware issue, you can likely request a repair or replacement from Apple.
5. Seek Professional Advice: Consider contacting Apple Support or visiting an Apple Store to confirm whether this issue might be related to a hardware fault. They can provide diagnostics to help determine whether it’s safe to proceed with the update.

In summary, carefully try updating through iTunes, and don’t hesitate to leverage your warranty if any issues arise again after the update.

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[Edited by Moderator]

I would update the phone, but if the pink lines continue, I'd take it to an Apple Store or Authorized Service Provider for evaluation and options.