Yeah, thumbs down to MagicJack for promising Linux support for about 3 years now...and never coming through. I think they officially admitted that they are not going to support it on Linux now. My MagicJack expired about a month ago, and I didn't renew, because I want to get Windows off of my 'puter, and MJ was the only reason I was hanging on to Windows- now I can obliterate it! I'll gladly pay a little more for a service that supports Linux- although I haven't researched the other providers yet.
There are one or two people out there who claim to have gotten MJ to work under Linux- but IMO, it's too much trouble. This technology is supposed to make our lives easier...not harder. I'll go for one that supports Linux.