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Upon checking, the Nokia C2-03 only supports the packet data connection, which means that whenever you need to use the internet, it will use the internet that is being provided by your network provider. In order for you to be able to use it, you need to get your internet settings from your provider and set it as your active access point. You can do this by following these steps:
1. Go to Settings
2. Tap on Connectivity
3. Select Packet data
4. Tap on Packet data settings
5. Tap on Active acc.point
6. Select the correct Access Point
If you are having issues with connecting to the internet, please let us know. It would also help if you can provide the error message and a detailed description of the issue. Hope this helps!