how to activate a 3g connection manualy

i have created a 3g connection and set it to autoconnect. this works fine most of the time. however sometimes i want to manually unconnect or connect. how can i do this?

Are you using a setting in Yast to automatically connect?
If you wanted to have complete control over the connection, look into wvdial.

Many 3G devices are now handled adequately by NetworkManager-gnome for Gnome or plasmoid-networkmanagement for KDE.

no not yast. i use network manager. kde

thanks a lot about that tip with plasmoid. can you tell me why its not installed by default?