which one is best for battery economical consurm ? by using 3g, gprs or wifi ?

thanks,

In this row i think:

1. wifi
2. gprs
3. 3g

oh thanks

and how about bluetooth ?

anyway why wifi first then gprs ?
why not gprs then wifi ?

thanks,

and how about bluetooth?

1. BT
2. wifi
3. gprs
4. 3g

anyway why wifi first then gprs? why not gprs then wifi ?

Larger range means more energy consumption.

Larger bandwith means more energy consumption too. That's why 3g comes after gprs.