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First, you need to plug the magicjack to one of the USB ports of your computer (only temporarily) to register the magicjack and get your phone number.
So, please connect it to your computer's USB port, then wait for the application to show up on your screen. Then click "click here to register" on the left and follow the prompts.
When the registration finishes and you get your magicjack phone number, then try to place a call from the magicjack still connected to the computer. If it works, please ask somebody to call you back with the magicjack still connected to the computer as well.
If all is good, please remove the magicjack from your computer and follow the steps below:
(1) Connect the magicjack to the electric outlet. Also, (2) connect an Ethernet cable to the magicjack's ethernet port and the other end to one of the ports 1, 2, 3 or 4 on the back of the router. And (3) connect a phone to the magicjack's phone jack.