A. 1. Check your device settings: Ensure that your device settings allow for data usage. Sometimes, data may be restricted due to settings on your device. 2. Restart your device: A simple restart can sometimes resolve temporary issues with data availability. Turn off your device, wait a few seconds, and turn it back on.

B. 3. Clear cache: If you are experiencing issues with specific apps, try clearing the app cache. Go to your device settings, find the app, and select 'Clear Cache' to refresh its data.