This app is totally useless for voice calls. When I receive an incoming call, the caller has already gone to voicemail before my phone even starts ringing. Then the ads lock my phone up and the ringer never stops until I force reboot the phone. If I want to place an outgoing call, it literally takes 3 full minutes to get the full-screen ads out of the way and get the dialer brought up. Then, when the call is over, again the full-screen pop-up ads have covered the dialer and locked my screen up and I can't even get to the button to disconnect the call, which still shows as an ongoing call in my status bar even though the other side hung up minutes ago - and again I have to force reboot my phone.