If the Telegraph app is not opening and displays a blank screen, you can take several straightforward steps to troubleshoot and resolve this issue. Follow these detailed steps:

1. Restart Your Device
- Press and hold the power button until the power menu appears.
- Select "Power Off."
- Once your device is completely off, press the power button again to turn it back on.
- Check if the app opens correctly now - learn more.

2. Update the App
- Go to the App Store on your device.
- Search for “The Telegraph” app.
- If there’s an update available, tap “Update” to install the latest version.
- After updating, try launching the app again - learn more.

3. Clear App Cache (if possible)
- Navigate to your device’s Settings.
- Tap on "General" and then "iPhone Storage."
- Find and select “The Telegraph.”
- Check if there's an option to 'Offload App' and tap it. This will clear cache without deleting your documents - learn more.

4. Reinstall the App
- Press and hold the app icon until the menu appears, and select "Delete App."
- After uninstalling, go to the App Store and download “The Telegraph” app again.
- Open the app to see if it works properly now - learn more.

5. Check for iOS Updates
- Go to Settings > General > Software Update.
- If an update is available, download and install it.
- Once your device is updated, try opening The Telegraph again - learn more.

6. Check for System Errors
- If your app remains unresponsive, it could be worth checking if other apps are functioning correctly.
- If the issue is widespread, consider resetting network settings by navigating to Settings > General > Reset > Reset Network Settings.

7. Contact Support
- If none of these solutions resolve the issue, consider reaching out to The Telegraph's customer support for assistance.

By following these steps meticulously, you should be able to troubleshoot and potentially fix the blank screen issue with The Telegraph app.