Set connection type
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.
To specify the type of connection 
1 Select the menu item More | Settings.
2 Tap on the Connection type option.
 
*The connection type menu appears.
 
 
You have the following options:
Connection type
Description
VoIP
All calls are made via an existing internet connection (VoIP).
GSM
All calls are made via your mobile network.
Ask
When attempting a call, you can choose individually whether you would like to make the call via VoIP or your mobile network.
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.
Last modified date: 02.24.2021