If you wish to utilize mobile data, firstly, you need to subscribe to a 3G plan. Then, enable the network connection on your device to use it.
Here's how to activate network connection on Obi Worldphone S507:
Step 1: From the home screen, swipe down to open the notification panel.

Step 2: Touch the network icon.

Step 3: Select to turn on mobile data.

Wishing you all success.
