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There is an easy way to check your iPhone's data usage right on the iPhone itself. Start by going to your Settings and then go and select General, which is at the top of the third section of options right above
Mail, Contacts, Calendars. Once in here go to Usage, which is near the top right under About. Here you are going to see a series of different lines of information, including how much phone usage you have had, how much standby time, your current period of call time, lifetime call time, and how much sent and received Cellular Network Data there has been. At the bottom of this Usage menu you can Reset Statistics, but you will want to do this only at the beginning of every month so you can see the correct read out of how much iPhone Data you have used during that period.
