Download StrongSwan APK file for android from here or Search for "StrongSwan" in Play Store.
Install StrongSwan
Open StrongSwan client and tap on "Add VPN Profile"
Server: ikev2-hk.switchnetwork.me ( See server list )
VPN Type: IKEv2 EAP (Username/Password)
Username
Password
CA certificate: Select Automatically
Tap on save
4. Now tap on the newly created VPN profile to connect
Note: IKEv2 is recommended protocol for users who are connecting from China.