Android supports L2TP/IPsec since version 4.2x. If you have an older version, you need to choose another protocol.
Open the system settings.
Be sure you are in "Connections" tab and tap "More networks" menu item.
Tap "VPN" in order to get to VPN connections settings.
On "VPN" screen tap "+" sign at top right side of screen.
Fill VPN Connection form with next values.
Name: Trust.Zone-VPN
Type: L2TP/IPSec PSK
Server address: vpn.trust.zone
IPsec pre-shared key: trustzone
Trust.Zone-VPN
vpn.trust.zone
trustzone
Tap "Show advanced settings" and be sure that "Forwarding routes" is set to 0.0.0.0/0. Then tap "Save".
vpn.trust.zone
If all goes well, you should see new VPN connection, so tap it if you want to connect.
Trust.Zone-VPN
Put your username and password and check "Save account information" on if you want Android to remember your login credentials. Then tap "Connect".
Your Username: GİZLİ. Giriş veya görmek için kaydolun.
Your Password: GİZLİ. Giriş veya görmek için kaydolun.
If connection has been successfully established, you will see "Connected" near your VPN connection name as well as "key" sign in notification area.
Trust.Zone-VPN
Open Trust.Zone Main page or reload it if it is already open in order to check if your connection with Trust.Zone VPN is established correctly.
You can also visit our Connection Check Page.
IP adresiniz: x.x.x.x · 
Çek Cumhuriyeti ·
Şimdi TRUST.ZONE! Gerçek konumunuz gizli!
