It depends what else the phones are being used for. If they are regularly pulling down audio data for the web, or even fat, non-mobile-ized web pages, on a reg

It depends what else the phones are being used for. If they are regularly pulling down audio data for the web, or even fat, non-mobile-ized web pages, on a regular basis, then the incremental bump from a few dozen spam emails a day might be hard to notice...