You use the connection type to specify whether your calls are to be routed via a VoIP or GSM connection by default or whether you want to decide spontaneously which connection type to use before setting up the call.
1 Select the menu item More | Settings.
2 Tap on the Connection type option.
The connection type menu appears.
You have the following options:
3 Tap on the desired connection type.
Depending on the option selected, your calls are now made via VoIP or your mobile network. If you select “Ask”, a popup window appears when attempting a call, in which you can select the desired connection type.