Changing the APN is quite an easy task:
Head to Settings -> Connections
From there you should find the Smartone-Voda internet settings. If you aren’t already a Smartone user than you should be able to install the setting from the Network Wizard, which should also be located in the Connections folder.
Click on “Manage existing connections”
From the SMC-Voda Internet Settings you need to choose “SMC-Voda Internet” and then “Edit”.
Then you just need to click through with “Next” until you reach the “Access point name” screen.
You should see “SmarTone-Vodafone” as the APN.
Simply replace that with “Internet”
Once you have changed the APN the data sim should start working on the phone!