I will ditto what Ron just said, you can take your magicjack anywhere you want to. Just the other day I took my magicjack to the library where I was doing some research while listening to a teleconference on my headset. I used one of the Libraries computers which had a high speed connection.
The device works great, however, at home I've had some problems with dropped calls over the past few days, I'm beginning to wonder if my connection speed is to slow.