question: Use Auto-connect for Android to stay safe on untrusted networks
answer: 
  This guide shows you how to enable the ExpressVPN Android app’s Auto-connect feature. This feature keeps your traffic protected by automatically connecting to the VPN when joining a new network including public Wi-Fi. By default, the Auto-connect is disabled.
  
  Jump to…
  
  Enable the Auto-connect feature
  Mark networks as “trusted” (or “untrusted”)
  Disconnect the VPN when joining a trusted network
  Disable auto-connect
  
  Enable the Auto-connect feature
  In the ExpressVPN Android app, tap Options.