Hi there! I understand that your BorrowBox audiobooks won’t open when you’re using mobile data, but work fine on Wi-Fi. Let’s see if we can get this sorted out together.

To start, could you let me know whether the BorrowBox app gives any error messages specifically when you try to open audiobooks on mobile data? Also, have you noticed if you can at least download or stream other content on mobile data, or is it only audiobooks that don’t open?

In the meantime, here’s a simple step-by-step to try based on the common causes of this problem:

1. Check Mobile Data Permissions:
Confirm that the BorrowBox app has permission to use mobile data on your Android 10 device.
- Go to Settings > Apps > BorrowBox > Data Usage > Make sure "Allow background data usage" and "Allow app while Data saver on" are enabled.

2. Clear App Cache:
Sometimes cached data can interfere.
- Settings > Apps > BorrowBox > Storage > Clear Cache.

3. Check Data Saver or Restricted Data Mode:
Android’s Data Saver feature sometimes restricts mobile data usage for apps.
- Go to Settings > Network & Internet > Data Saver > Turn it off, or if it's on, allow BorrowBox unrestricted data access.

4. Check Network Settings:
Occasionally carrier APN settings or VPN use can affect streaming. Download another streaming app and try mobile data there—if it’s slow or blocked, it might be a network issue.

5. Update or Reinstall the App:
Make sure you have the latest version of BorrowBox.
- If already updated, uninstall and reinstall to reset and clear any corrupted files2.

If after this the issue persists, let me know if the audiobooks fail to download or just fail to play streaming over mobile data. That info can help pinpoint the cause—sometimes, the app itself restricts large downloads to Wi-Fi only by default.

Are you okay to try these steps? Let me know what you have tried already or if you need help navigating any of these settings.