Hi there! I understand you're having trouble logging into the ID90 Travel mobile app on your iPhone even after reinstalling it, while it works fine on your laptop. Let’s see if we can get this sorted out.

A couple of quick questions to help diagnose:
- Are you seeing any error messages when you try to log in on the app? If so, what do they say?
- Are you entering the exact same username and password that you use on your laptop?
- Is your iPhone connected to Wi-Fi or using cellular data when you try logging in?
- Have you checked if the app has the necessary permissions enabled on your iPhone (like access to network, storage, etc.)?

Meanwhile, here are some troubleshooting steps you can try, starting with the simplest:

1. Check your internet connection: Make sure your iPhone has a stable internet connection, as network issues can block login attempts.

2. Verify credentials carefully: Sometimes auto-filled passwords may be outdated. Try typing your username and password manually to rule out any typo.

3. Clear app cache (since you reinstalled, it should be clear already): Confirm you did a full uninstall, then reinstalled from the official App Store to get the latest version.

4. Restart your iPhone: This can resolve temporary glitches affecting app login.

5. Update iOS: Your version 18_6_1 seems recent, but checking for any minor updates in Settings > General > Software Update wouldn't hurt.

6. Check app permissions: Go to Settings > ID90 Travel and ensure the app has permissions to use your network.

If none of that helps, the issue might be related to your account's mobile app access or an app-specific bug. In that case, contacting ID90 Travel’s support directly at [email protected] can get you specialized help.

Let me know how these steps go or if you see any specific error message during login. I’m here to help! Are you satisfied with the solution I provided so far?