To resolve the issue with mydlink cameras not working on your iPhone running iOS 18.1, you can follow these steps:

1. Check App Updates: Ensure the mydlink app is up to date. Visit the App Store, search for "mydlink," and check for any available updates. Keeping the app updated helps in compatibility with the latest iOS versions - learn more.

2. Restart Your Devices: Restart both your iPhone and the Wi-Fi router. This can resolve temporary connectivity issues.

3. Check Internet Connection: Make sure your iPhone has a stable internet connection. You can do this by checking if other apps are able to connect to the internet.

4. Forget and Reconnect to Wi-Fi: Go to Settings on your iPhone, tap on Wi-Fi, find your network, tap on it, and select "Forget This Network." Then reconnect by entering your Wi-Fi passphrase again. This can sometimes resolve connectivity issues with apps - learn more.

5. Disable Private Address: On your Wi-Fi settings, consider disabling the "Private Address" option. To do this, go to Settings > Wi-Fi > tap the info icon next to your network > toggle off "Private Address" - learn more.

6. Reinstall the mydlink App: If the above steps don’t work, try deleting the mydlink app and reinstalling it from the App Store. This can fix any corrupted files that may be causing issues.

7. Check for iOS Updates: Sometimes, compatibility between apps and the operating system can lead to issues post-update. Go to Settings > General > Software Update and ensure that you are running the latest iOS version available.

8. Consult D-Link Forums: If the issue persists, check D-Link forums for similar issues reported by other users. Sometimes, community suggestions can provide a solution that specific updates or configurations need - learn more.

9. Contact D-Link Support: If none of these steps resolve the issues, consider reaching out to D-Link customer support for further assistance. They may have specific guidance for compatibility with iOS 18.1 - learn more.

Implement these steps methodically to identify and resolve the problem with your mydlink cameras.