Well after reading all the reviews, I decided to sign up for the introductory special on December the 4th and I'm afraid that my service has been less than expected.First it was a problem with the 911 address, then when I hooked up the Grandstream device and dialed my number, all I got was a busy signal. That problem was apparently worked out(after a whole day) until I discovered yesterday that I could not call in to my phone, guess what, now I get a busy signal when it rings and I answer it, and so far since 11am this morning when I reported this problem, it is yet to be fixed(it is now 7:15pm). So, since I hooked up the device on December 7th, I have not been able to use my phone for two way calling. If this level of service continues, I will have no choice but to send the GS device back before my 30 days is up and return to Callcentric. I was really hoping to have a better experience with Voipo.