X-VPN provides free servers on mobile. There will be interstitial ads when you connect with free servers.
X-VPN provides 8000+ servers at 50+ global locations for VIP users. You can check details in “Select Location”
X-VPN iOS version supports “Choose Protocol, Kill Switch, IP Checker and DNS Leak test”.
X-VPN Android version supports more functions like “Connect from notification bar, App Control”. But these advanced functions are only available for premium users.