If you browse the Internet via mobile data and don't have an Internet connection on your smartphone, there might be an issue with your SIM card or the SIM-card slot itself. If you didn't keep and use your smartphone properly or if you accidently dropped it, you might have knocked the SIM card out of place.
As one of the first steps of troubleshooting internet connection, switch off the phone and remove the SIM card. Check the SIM slot and the card itself to make sure there are no obvious lumps of dust or other damage. If everything looks good, put the SIM card back in and turn on the smartphone.
If your mobile data was accidently turned off or disabled, that would be a very good reason why you can't browse the net, nor use applications like Facebook, Youtube and etc.
If you are wondering how to fix internet connection, you need to ensure that mobile data is enabled. To learn how to enable or disable mobile data, check out the don't know how to enable/disable mobile data solutions.
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