Recently I bought an iPad 3g sim and was able to activate it without an iPad and play around with it in my iPhone 3gs. I changed the APN settings in the iPhone and now have unlimited data on my jailbroken iphone 3gs. I wanted to somehow use my google voice number to make unlimited calls. I have a gizmo5 account and right now I use the google voice webapp to call my gizmo5 number. That requires me to swtich from safari to fring (my sip client for gizmo5). Changing apps all the time has become quite a hassle. I was wondering if there was an all in one app that functions as a GV client as well as a SIP client that way when making a call I dont have to switch apps. Any advice would be greatly appreciated. Thanks in advance.