Magic Jack is a VoIP service. That is voice over internet protocol. This means that you can plug the USB thumb drive into any computer on high speed internet which means ethernet connection. You then hook a telephone of any type into it and get a dial tone. You can carry the thumb drive anywhere in the world as long as there is an ethernet connection. This means you can make and receive calls from Japan, Korea, Australia, Germany, U.K. You get the idea. You can also hook it up at home and make unlimited calls to the U.S. and Canada. I know people who have these and are quite satisfied. No, I don't sell the service, even though I was with a VoIP pioneer 5 years ago. Through this, I now have a service where I can call 44 countries, including the U.S. and Canada. I can have up to 6 different area codes on the phone along with a whole host of features including a "blacklist" which is my favorite. I control my own service right through the internet. I can also move anywhere in the world and keep my same numbers. All this for $27.00 per month.
No, it does not provide the mobility of a cell phone as I can't be driving in my car and talking on the phone. I carry a pre-paid cell phone at $15.00 per month for that. Let's see now, my total phone cost is $42.00 per month. I think I'll stay where I am. The rest of you need to get a grip on reality.