We always strive to ensure that you're up to date on your data! Although specific services or apps are not available for itemization. You can certainly review our Data Utilization tool to get an idea of usage. http://vz.to/1CtC3po . Did you receive alerts towards usage?
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No carrier has access to the source of your data use.
The data is also, independently recorded on your device. Which device and what does it show for data use For the billing period?