Could someone help me with a few queries with respect to using a USB Dongle on the PC for internet connectivity? 1) Is there any difference in the bandwidth/speed when we use a 2G sim or a 3G sim card? 2) Apparently there are two types of dongles (a) One in which the sim is integrated with the dongle (b) One in which we can insert any sim into the dongle Is there any difference in the bandwidth/speed for these two types of dongles? The Airtel site says that there are two models of dongles available: (a) E153 with HSDPA 3.6 Mbps, chipset QUALCOMM MSM6246 (b) E1731 with HSDPA 7.2 Mbps HSUPA 5.76 Mbps, chipset QUALCOMM MSM6290 Will there be a difference in speed in the two models if I use a 2G sim card? In other word, what will be the bottleneck the type of sim card or the model of the dongle? Thank you.