Does NymVPN offer Always-on/Kill switch features on Android?

NymVPN aims to support for features such as Android’s “Always-on VPN”, but currently this option is unavailable.

How to enable “Always-on VPN”? 

In the NymVPN Android app, access the Settings menu and open the “Kill switch” option which will prompt you to enable the “Always-on VPN” in Android’s VPN settings menu. This will ensure that your VPN is always connected and it will start automatically even after your system reboots. 

If you enable "Block connections without VPN" (a setting that can be enabled along with Always on VPN), then all network traffic will be blocked while you are not connected to the VPN.