I first tried to connect and register my magicJack on my Intel 24" white iMac running 10.5.1 and kept being unable to finish registering it.
I then tried the Chat customer support they have, and after 10 minutes wait, a tech came on, listen to my issue, and finally after checking with someone else, insisted that it would not work until after I upgraded it on a PC running wndows first, then it would work on my mac, he said.
What he did not know, is that the friend who had introduced me to magicJack had connected hers, blissfully unaware, to her white 24" intel iMac directly, registered it successfully and stated using it within 10 minutes, all without a PC. So I called my friend and investigated...
Despite what their website, and their customer support say, MagicJack does work DIRECTLY on a mac, without having to 1st update it on a PC, AS LONG AS you connect it first and register it on an Intel Mac running 10.4.xx, but NOT 10.5.xx. I just did this myself earlier today, and it works perfectly. The mac I used to register and get my phone number was running 10.4.11 to be exact. Then I went home and connected it to my own 24" iMac running 10.5.2, and everything is working perfectly! 🙂 I don't know if it'd work on any other version of 10.4 though...
Once it is registered successfully on the intel Mac 10.4.xx, then it can be connected to any other intel mac and be used. This has been my experience today, as well as my friend's who told me about magicJack. Hope this is helpful.
Happy calling. 🙂