You would likely need a prepaid sim card as well I think that was notatoad's point. To use GPRS modules, I would think you need to buy access to the towers fr

You would likely need a prepaid sim card as well I think that was notatoad's point. To use GPRS modules, I would think you need to buy access to the towers from somebody. I don't see how that would be cheaper than using WiFi, because you would have to pay for every communication.