Samsung Galaxy S4 No Outbound Calls White Screen issue

My friend got a new Samsung Galaxy S4 and he is pretty excited about the new phone and downloaded and install bunch of application on it. The phone runs perfectly until he try to call someone. He told me that when he is calling or making an outbound call it just show a blank white screen. Basic troubleshooting is done like restarted the phone several times, removed reattached the SIM and SD card, check the settings but it looks like normal. I ask him if he try to use the phone when no application was installed and he told me

that its working fine.  The only resolution for this is check all the application that he install on the phone. Checking the software is difficult but since the issue is making outbound call I told him to check an application that use phone call. The phone has Viper a free calling application and the settings was set to default. Option for this is to clear the default under Settings application manager. Or check Call Settings. Open your Phone App then press the Menu Key. Press Call Settings ..then scroll to the bottom and press "Use Internet Calling" under Internet Call Settings. Make sure that "Only Internet Calls" is selected