I just wanted to post my success with CSipSimple as a sip/voip app. I had used Sipdroid for a week or so and it was very rough around the edges. In a desire to find something better, I went through about five programs that promise to do the same thing. I'm here to report that CSipSimple is king of them all, hands down! The app is nice in functionality and looks. It has a nice setup wizard that asks you where you have your free sip account at and simply prompts you for your logon info, knowing the other settings based on the fact that you already told it who you get your sip service from. I am in no way anything other than a blown-away third party user of the software and it simply works! FWIW I'm running an LG Optimus V and Froyo.