I can't say enough good things about GrooveIP. I now have it working on my Wifi Galaxy Tab 7" allowing me to make calls through my tablet. No sim card in this device and I still can make calls. This will be helpful when my phone is out of battery. The Tab gets great battery life and there are times when I am on wifi when using this would be convenient. What a great app! I think it was the best $4.99 I have spent on an Android app.