Arduino + Xbee + 3G

Projects General Guidance
3

But I think I should use 3G, and that is GSM/GPRS. My project is:

(1) Arduino + GPS + ZigBee (mote)
(2) Arduino + ZigBee + 3G ("Gateway")
(3) Smartphone Android (application)

The GPS data of (1) is sent from (1) to (2) via ZigBee. Then, (2) sends that data received (GPS data of (1)) to (3) via 3G. Can I use GSM/GPRS for that instead of 3G? I have doubts. Enough bandwith?

Is easy to connect (2) and (3) via 3G or GSM/GPRS? How can I do it?

Any project like this?

Thanks!