Take the following steps to troubleshoot your mobile data connection:

1. Turn your mobile device off, then turn it back on.
2. Toggle the mobile data connection on your device.
3. Update your mobile network settings.
4. Check that your mobile data plan allows access to mobile internet.
5. Check that airplane mode is not active on your device.
6. Check that you have sufficient cell reception for your data plan.
7. Contact your wireless provider for further assistance.