Kill Switch

Browsec provides the most reliable killswitch functionality because it uses system settings- Always-ON VPN.

Tap  for menu, then tap 'Always-On VPN':

Tap 'VPN SETTINGS':

Tap gear next to Browsec:

Browsec uses system settings for kill-switching, and this is the most reliable way on Android.

Tap the 'Always-On VPN' and 'Block connections...' switches:

Tap 'Turn on' in the 'Require VPN connection?' box:

That's all, now you've set up the VPN killswitch with help of Browsec. Your real IP never gets exposed with this setup.

Note: The Always-On VPN feature is supported in Android 7 and higher.