Hi there! I understand how frustrating it can be when an app keeps crashing, especially when you're trying to make a call. Let’s work together to resolve this issue with Free Tone.

First, could you provide me with a little more detail? Specifically, when did this problem start happening? Also, have you recently updated the app or your Linux system? This information will help me understand the situation better.

In the meantime, here are a few steps you can try that often help with app crashing issues:

1. Clear Cache and Data: Sometimes, clearing the cache and data for the app can solve crashing problems. You can usually do this through your settings:
- Go to your system settings.
- Find 'Apps' or 'Application Manager'.
- Locate Free Tone in the list and tap on it.
- Select 'Storage' and then choose 'Clear Cache' and 'Clear Data'.

2. Update Dependencies: As you're using Linux, make sure that you have all the necessary dependencies updated. You might want to check if you have the Android System WebView updated too, as it can occasionally affect apps that rely on web components.

3. Reinstall the App: If the above steps didn't help, try uninstalling Free Tone and then reinstalling it. This can often resolve persistent issues related to app crashes.

4. Check for System Updates: Ensure your Linux operating system is up to date, as updates can include specific fixes that improve app compatibility.

Please try these steps and let me know how it goes! If the issue persists, we can look into additional options together. Are you satisfied with the direction we're going?