When I plug my magic jack without my computer I get an ERROR 48 message.

It's got the wrong gateway setting. Without a gateway (router) to the Internet it can only see local network stuff. I suspect the Magic Jack is still trying to be the gateway but it has no Internet. Stop Magic Jack doing this and it should work.

Your internet connection is bad

...and did you check your internet connection or visit customer care at magicjack.com? Why are you asking about it here?

To use without computer plug ethernet cord into magicjack otherend into router plug phone in to magicjack plus plug magic jack plus int power adapter plug power adapter into power outlet should work but does not no calls in or out in reverseorder and has to be online with internet conection .

You should clean your computer from the effects of programs and browsers and then close the device and then open a new site

You should clean your computer from the effects of programs and browsers and then close the device and then open a new site of the new browser

Magicjack software is stored in the Magicjack module. Plug that module into a USB port on your computer. You should get an onscreen message like: "Install or run program from your media".
Click on "Start Magicjack". That will install the software on your computer.
More information at:
http://www.magicjack.com/how-it-works.html

i have error 400 whut it is

It won't help. Magic Jack is DIGITAL your fax machine is ANALOG

My Magic Jack was working fine. One day I got some viruses in my computer and I ran setup CD.After that magic jack is not working, it always display "Warning you must plug magic jack into usb".
I tried to chat with tech persons so many times and tried many methods but when they say "now unplug and plug in" , then magic jack home page opened on chating window (always) and stopped chating.

and still I'm getting same 'warning' message.