Now you can know, using SPB Wireless Monitor from SPB Wireless. The $9.95 app, from the Android Market, runs on Android 2.1 and higher smartphones (it was originally for Windows Mobile). It monitors your wireless connections, tracks the amount of data being moved, and tallies up the costs based on your data plan.
But buyer beware: some of the app's screens carry this warning at the bottom: "Some reports might be inaccurate." Depending on which ones, to what degree, and how often, the level of possible inaccuracy could really affect the program's usefulness.
The Age of Unlimited Smartphone Data Plans was short-lived. You can still get them (Verizon Wireless offers, for now, an unlimited plan for the CDMA iPhone 4), but in June 2010, AT&T set the new direction by unveiling tiered plans: subscribers could choose from a pair of capped data plans, and buy additional data if needed.
Even better, you can set SWM to warn you about costly data usage. You can get data traffic reports that are application-based or time-based, view the reports on your screen, share them or export them in CSV files. SWM can calculate costs based on peak and off-peak tariffs from over 300 different service plans worldwide.
John Cox covers wireless networking and mobile computing for Network World.
Twitter: http://twitter.com/johnwcoxnww
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This story, "Android App Could Slash Smartphone Data Bills" was originally published by Network World.