The app itself is great. The problems start with the cheaply made adapter you buy for $50. It has now broken twice on me. The pattern is that it works for three months and then stops working. You get little or no support from the company. The first time the adapter broke on me I sent it back and had email after email exchange to get it fixed. After much hassle it was fixed. I would not recommend getting this app and going this route to voice. Too much of a headache and it does not work long term.