Here are the steps you should take to troubleshoot your phone’s mobile data:

1. Restart Your Phone: Turn your phone off and then back on again to refresh the connection and see if this resolves any mobile data issues.
2. Check Your Network Settings: Make sure you have your mobile network settings turned on and that your device is configured properly for cellular data.
3. Check with Your Carrier: Contact your cellular provider to ensure your account is active and set up correctly.
4. Contact Your Device Manufacturer: Reach out to the manufacturer of your phone and ask them to help you troubleshoot mobile data issues that may be caused by the system update.