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 PPTP VPN :

Description: TUVPN (i.e.)

Server:   For Shared IP VPN Service Users: TUVPN Server that we want to connect

                For Dedicated IP VPN Service Users You MUST choose the VPN Server for which you have subscribed

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 !