I found world of difference between Mobile (E52) Bluetooth - Mobile (Same E52) USB Cable - Data Card (Huawei E122), using the same SIM in almost the same position.
Bluetooth gave me 55-60 kB/s
USB gave me 130-150 kB/s
Data Card - awesome performance - maxed out upto 450 kB/s (3.6 Mbps)
Bluetooth gave me 55-60 kB/s
USB gave me 130-150 kB/s
Data Card - awesome performance - maxed out upto 450 kB/s (3.6 Mbps)