People who have had it have said that the Majic jack software installs a lot of spam tyoe stuff into your computer that is very difficult to remove.
Not sure there is any truth to this. I had my first MJ installed on my office computer and never noticed any trouble. Later I decided it was best to put it on a dedicated computer I had as a spare here since I wanted to relocate it to a different part of the house. ( My father's room) That computer was only used to support the MJ device and as such never for e-mail or web browsing. When this rumor came out, I checked and the browser was clean. Only thing on the desktop was the MJ software.
I paid for 5 years of service and the hardware was free in that special. All calls are Long distance free and the only time I disconnect it is to put it on my office computer where I connect my FAX to it for that purpose on rare occasions.
MJ will also send you a Voice mail audio file via e-mail if someone calls and leaves a voice mail. No spam on that e-mail either.
From a power consumption viewpoint, connecting it to a dedicated computer may not be wise but it does keep it off your main computer in case that does become a nuisance for you.
At one time I did route it through my home phone wiring to have it on several phones in the house. Only problem I had was I had to bypass the switching network I had from the phone company for 3 lines. I bridged the lines and this made all phones ring on the MJ line.
Is the phone number and service tied to the USB device, to the computer, or to an IP address? If it is tied to the USB device, can I then take it with me and use it on another computer that has internet access?
Tied to the device- Take it with you. If you have a laptop with internet broadband connection, plug it in to your laptop and the software will download and self install. then just make your calls in a few minutes after self installation. Take it with you to an internet cafe along with a small portable phone and it will work too.
If the computer is sleeping, will the phone still work? Yes, but you should keep the harddrive from sleeping as it may be too much delay as it spins up. I always had my dad's computer go into sleep mode and shut down the monitor too.
What did not work was WinFax on the same computer as the MJ. I gave up trying to get that to work. MJ on one computer and winFax on a second computer does work.