I want to share with you guys that you can easily gain upto 5mbps if you connect the device directly via USB
I was using it via wifi and was charging it from charger or lcd tv etc. The other day for charging I connected the zong wifi device to my laptop and it installed it as a device like ptcl evo. I was having two networks. one direct device and other one wifi. I switched off wifi.
on the same loc same conditions and full 3g signals with wifi I was getting about 9 to 10 mbps but when I did test while device was directly connected the speed test result jumped to 15mbps.
similarly in places where I was getting 3 to 4 on wifi , it jumped to 7 and 8 mbps on direct usb connection
Try it guys