Who I have the same questioned this topic

I certainly don’t want surprises for your usage, SILVERRIDGE. As Ann154 mentioned, data can be a number of web-based services on your phone and the options will vary based on your device. What model phone(s) do you have sharing the 12GB? You can also use our fantastic data calculator at http://www.verizonwireless.com/b2c/splash/dataShareCalculator.jsp to get a better idea of your use in addition to other great tools for monitoring your usage at http://www.verizonwireless.com/support/tools-for-monitoring-usage/#datau.

JenniferH_VZW
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