How do I establish data connection using the app?

To connect just activate Active Keep Alive and press OK when prompted. You can also press Force Connect button. Make sure that you have correct APN settings and an active internet subscription. You may also try restarting your device or adjusting Wait Time in Active Reconnect settings. In case restarting the device helps, you should try Reset Radio and Refresh Radio options in settings which can solve your problem automatically without restarting the device. If the app is resetting your connection too often, turn off Reset on Failure in Active Keep Alive settings.