We open Settings menu.
We open now the General submenu.
We choose Network.
Now we click on VPN to configure it.
We Add a new VPN configuration.
We enter now all configurations details for the L2TP VPN :
Select L2TP tab and enter the following configurations.
Description: Tuvpn L2tp(i.e.)
Account: Your VPN account name (tuvpn_....)
Pasword: Obviously, your VPN password
Send All Traffic must be ON (default)
And we connect to TUVPN.COM and all our mobile communications from our iPhone are protected !
You can confirm the connection by browsing any of the IP-Lookup web such as: www.whatismyip.com !