This billing error message is usually due to a problem with the Google Play Store app or the internet connection.

1. Make sure that your device is connected to the Internet.
2. Go to your Android Settings > Applications > Google Play Store and choose the 'Clear Cache' option.
3. Launch the Google Play Store app on your device and wait until it completely loads.
4. Launch the Muslim Pro app and try to purchase or restore the app again.

Other alternatives

If this still doesn’t help, please make sure that you have installed all the latest system updates available for your device and that you are running the latest version of the Google Play Store app. You may also try to restart your device.

If your device is running Android 2.0 or 2.1, please note that the latest version (v3) of the Google billing service unfortunately requires you to run Android 2.2 or above.

Should you require further assistance, kindly contact us at support@muslimpro.com