After monitoring the data useage on our plan and paying for overuse twice I received yet another text message notifying me that I was exceeding my data plan yet again. Since a lot of the use on the iPhone is via Wifi I did not understand. After spending a little bit of time with Verizon Tech support I discovered that even though my phone said it had been updated to IOS6.3.1 it had not. We backed up the phone and restored to factory settings only to discover that when email is open the system is constantly running. Still haven't solved the issue. Has anyone experienced this issue?