To add up on that, if the hardware supports 3G only, it'll run up to that transmission technology and its relative speed, period.
The only way you'll achieve more is with WiFi.
If you don't want to spend for a separate data plan and already got a good one with your iPhone/Android/Windows phone which supports Hotspot setups, you can use that too.
I did it for a while, worked like a charm and allowed me to go over the 3G limitation.