Hi there! I understand the Simplilearn app is saying there's no network connection even though your mobile data is active. Let's work through this together.

Could you please tell me if other apps on your Android 10 device are able to use the internet via mobile data? Also, have you already tried any steps like restarting the phone or toggling mobile data off and on?

In the meantime, here's a step-by-step you can try:

1. Toggle Airplane Mode: Turn on Airplane mode for about 10 seconds, then turn it off. This refreshes mobile network connections.

2. Check App Permissions: Go to your device Settings > Apps > Simplilearn > Permissions and make sure it has permission to use mobile data.

3. Clear App Cache and Data: Go to Settings > Apps > Simplilearn > Storage > Clear Cache, then Clear Data. This resets temporary files that might cause connection issues.

4. Check Data Saver and Background Data: Confirm that Data Saver mode is off. Also, in Simplilearn app settings, ensure Background Data usage is allowed so it can access data when running in the background.

5. Update or Reinstall the App: Visit Google Play Store and check if there is an update for Simplilearn. If yes, update it. If no luck, uninstall and reinstall the app.

6. Check Your Network Settings: Sometimes, network settings can have glitches. Go to Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth. This will reset network settings but won't delete your personal data.

After trying these, please launch the app again and see if the issue persists. Let me know how it goes, and I’m here to assist you further!