Method 1 (standard install)
This is the standard install simply plug the device into your computer plug your phone into the device then let it install (this is automatic and does not take long) Fill out the questions pick a number and your done. For more information check out there website
Method 2 (thriftyal's method full house primary number install)
1.) Disconnect your previous Phone providers line from your main box either by
1a.) Pull the wires that come in from your main box and attach to your phone junction box or
1b.) Open the previous phone providers box (the grey box on the side of your house) and disconnect the phone line (simply unplug it)
Now pick up your phone to confirm the line is disconnected if not try again you must have disconnected the wrong wires.
2.) Connect your magic Jack device to the back of your computer and the plug a male to male phone cord into the device and connect the other end of the cord into an empty phone jack in your house.
3.) let the device install on its own and Magic jack is now your primary phone line