The iPhone is an awesome device that gives you many options to manage your data usage. While there is not a way to disable data for each app individually you can disable the data all together if needed. To turn off data go to Settings>Network>Cellular Data>Off. This will not allow any data function on the phone at all. You can also use My Verizon to monitor your data usage to help stay within your allowance. I would be happy to answer any additional questions that you may have.
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