Hi! I’m Henry Adams, happy to help you get the Trivago app working on your iPhone. When you say the app won’t open, can you tell me what happens exactly when you tap the app icon? Does it show a loading screen, crash, or just not respond at all?

Meanwhile, let me guide you through some quick checks and fixes for iOS 18.6.2:

1. Force Close and Reopen the App:
- Swipe up from the bottom of the screen and pause to see the app switcher.
- Find the Trivago app preview and swipe it up off the screen to close it completely.
- Now try reopening the app.

2. Restart Your iPhone:
- Hold the side button and either volume button until the power off slider appears.
- Slide to power off, wait 30 seconds, and turn it back on.
- Try launching the app again.

3. Check for Updates:
- Go to the App Store.
- Tap your profile icon at the top right and scroll to see if there’s an update available for Trivago. If yes, update it and then open.

4. Free Up Storage (if your phone is low on space):
- Go to Settings > General > iPhone Storage and see if space is critically low.
- If yes, try deleting some unused apps or large files and then try again.

5. Reinstall the App:
- Press and hold on the Trivago icon until options appear, tap “Remove App” then “Delete App.”
- Open the App Store and reinstall Trivago, then launch it.

If you’ve tried any of these already, please let me know which ones so I don’t repeat, and we can dive deeper. Also, if there are any specific error messages or behavior details, that will help me diagnose better.

Looking forward to your reply!