Hi! I see you're experiencing a white screen on your iPhone running iOS 18.5. To help you better, could you tell me a bit more about when this white screen appears? For example:
- Is it happening when you open a specific app or while using the phone in general?
- Does the screen respond to touch at all or is it completely frozen?
- Have you tried restarting your phone yet?

Once I have a clearer picture, I can guide you through steps to fix it. Meanwhile, here are some initial things you can try:

1. Force Restart Your iPhone
- Quickly press and release the Volume Up button, then Volume Down button.
- Press and hold the Side button until the Apple logo appears, then release.
This can sometimes clear temporary glitches causing blank or white screens.

2. Check for App-specific issues
If the white screen appears only when opening a particular app, try closing that app from the app switcher completely and reopening it. If that doesn’t work, uninstalling and reinstalling the app might help.

3. Update iOS and Apps
Make sure your iOS and apps are up to date in case this is a known issue that has been fixed in updates.

4. Reset All Settings
If the above doesn’t help, you can try resetting your phone’s settings without deleting your data:
- Go to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings.

Could you let me know if this white screen is app-specific or happening system-wide? Also, have you noticed any recent changes or app installs before this started?

We can dig deeper based on your answers!