i ihave installed nokia vpn client o my nokia 6680,but i could not make use of it.Could some one guide me? i would be most greatful.i could not find the application to run but it is in the application manager and the details says it has been installed.
mubeey.

You need a Nokia Security Service Manage server to create a policy file delivered over-the-air (OTA) or as an installable .sis file. Without the policy file, the VPN client is useless. Read more here: http://europe.nokia.com/nokia/0,0,77557,0.html

how can i get the policy file or the installable .sis file.

The only way I'm aware of: By generating it for your VPN gateway on your Nokia Security Service Manager server, which you get when you buy a Nokia VPN gateway (I don't know if the server can be obtained separately if or when you don't have a Nokia VPN gateway).