I port my number from via talk for few reasons and one of the reason was the poor call quality!
I was checking other reviews and deals and found the phone power had good deal buy one year and second is free! I bought the adapter from local store for their service for $79 and they did give me a credit .
I was kind of worry that they might be not as good but I had not much to lose since via talk service was so bad that I had to forward all my calls to land line since their service was not clear or drops and sometimes I could not hear callers.
Anyway, I was with phone power since 01/04/2011 and they are great! clear quality and no drop calls ! it works just as good as land line but they offer easy navigate website and also soft phone ! I am really happy for making my choice!