which I think you need an old gizmo5 account to do? Not anymore. You can do VOIP calls through a browser, and I do them with my iPhone using the Talkatone app

which I think you need an old gizmo5 account to do? Not anymore. You can do VOIP calls through a browser, and I do them with my iPhone using the Talkatone app (free). (Ironic that this is through GV but Google's GV app doesn't support VOIP calls; someone else had to implement that.)