RE: magic jackI use the Majic Jack when on Vacation, for it saves me from buying expensive phone cards or hotel long distance charges. It retails for about $40 and costs approx. $30/year.
The downsides :
-the contract only covers long distance in North America, unless the person on the other end is using a Magic Jack as well.
-the audio quality is poor and the jack overheats if plugged in for a long amount of time.
-one has to carry a laptop, a regular phone and be near a power outlet to use it.
So no comparison imo, for KNCTR is really free and much user friendly, plus INT integration of their platforms is going way beyond from just free phone calling.
Cheers!