I just installed and am trying out Line2 with my iPhone4. Actually seems to be working pretty well for voice and texting. For me, the sound quality so far has been a little better than Skype and I like that I can also use my bluetooth with it. I am thinking of trying it out on my daughter's iPod Touch 4th gen and then she basically can use it as a phone when WiFi is available. Anyone else using this app? Seem to work well? Any issues? Thanks!