GMGruman writes "Carriers are increasingly charging for 3G mobile access by the megabyte, to prevent 'unfair' subsidies of heavy users by everyone else. So why does the price of a 3G megabyte vary based on the device used to send or receive it? Why is an iPad megabyte cheaper than a MiFi one? After all, a megabyte is a megabyte as far as the network is concerned. InfoWorld has a comparison of 3G pricing for the four major US carriers for their various supported devices, so you can see whose 3G pricing is out of whack for which devices."