I am not sure, but Dongle is related to the data card of specific mobile company. You can use the interenet of only that specifc compnay from which use bought that data carad, that is Dongle. While in Data Card, you can use internet of any mobile operator. You just have to replace the SIM into the Data Card. In Dongle, you can not replace the SIM. I am not sure about this, but I guess this is the difference between Data Card and Dongle. I personally use Data Card of Huwaii company. I can insert SIM card of any mobile operator in it for internet. I also get calls and SMS on my laptop at the time I connect my data card having SIM card in it to my laptop.