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call accounts, touch your mobile network. 
  If you want to make a choice each time you make a call, 
touch Ask first. 
To automatically stop Internet calls: 
You can configure the phone to automatically stop Internet calls 
when the other party does not support Internet calling. 
1.  Touch the Home Key >    >    (in the top search field) > 
Settings > Call settings > Phone account settings. 
2.  Touch Use SIP calling > Only for SIP calls. 
To configure your phone to receive Internet calls: 
By default, your phone is configured to make Internet calls, but 
not to ensure that you will receive them. But you can configure 
your phone to listen for Internet calls made to an Internet calling 
account you added to your phone. 
1.  Touch the Home Key >    >    (in the top search field) > 
Settings > Call settings > Phone account settings. 
2.  Check Receive incoming calls. Checking this setting will 
reduce your battery life between charges. 
Other Options 
1.  Touch the Home Key >    >    (in the top search field) > 
Settings > Call settings > Additional settings. 
2.  Touch Caller ID to choose whether your number is displayed 
when someone receives your outgoing call. Or check Call 
waiting to get notified of incoming calls during a call.