Micromax 3g usb modem is a usb device that acts as modem to connect through the internet via 3G/2G sim cards.Micromax usb modem is working quite good and i suggest people to buy it instead buying some operator tagged usim which is quite costly .
Benifits : The main advantage of micromax usb modem is that it supports all the operators and can work for 3G as well as on 2G signals.The speed you will receive by using a 3G sim(USIM) is equivalent to the broadband speed.
Here is a link to test the speed of your internet connection :
www.speedtest.net