App no longer freezes when running in background. System sounds (text alerts, etc) are back. 3G is far from perfect, but works better than other voip apps. Some bugs remain when answering (freezes/doesnt always pick up when answering 3G calls). While trying to answer a wifi call it randomly dialed someone in my contact list and I could hear them and the phone still ringing at the same time, yet couldnt talk or pick up the incoming call. Come on guys, you have a nice app, but this strange behavior is unacceptable. G729 codec (best for 3G) is an extra $10.