curbi filters content through the VPN on an iOS device.  The VPN pushes network traffic through the curbi servers which allows you to monitor and view usage on an iOS device.

Sometimes, if you experience network issues or regional licensing restrictions you can choose to turn the VPN off.

To do this log into your curbi account from Safari or the curbi parent App and click on the device name.

Tap on the Device tab and you will see the Internet Filtering switch.  Just switch it off.

IMPORTANT: Remember that turning OFF "Content Filtering" also turns OFF usage reporting.