We are having the exact same problem. With 6 phones, our data stayed between 10-12 Gygs a month the entire 2 years. We all got iPhone5c the end of May '14 and EVERY month our data usage is 24+ gygs and that's NOT including the 1 FREE gyg a month they said they gave us for 12 months. A little over a month ago, one of the lines switched back to a Galaxy and her monthly data usage has dropped OVER HALF! I pulled up the data usage online for each number before and after getting the new iPhones. In the months AFTER, there's a total number of data entries billed for, but gets repeated, which explains our data usage supposedly doubling. I'll use my daughters as an example. There were 915 entries and she was billed over 10 gygs. The first 4 days of the billing cycle was her OLD phone, entries 1-9, 5/23-5/27. Entries 10-482 was her new phone, 5/28-6/22. But there are 915 entries. That's because they repeat EXACTLY. Entry 483 is exactly the same as entry 10.
484 is exactly the same as 11. So are 485 and 12, 486 and 13, 487 and 14... And so on, ending with entry 915 being exactly the same as entry 482. Verizon claims we were not doubled charged, but the total claimed as usage and the total billed for, are the exact same dates, times and usage amounts REPEATED! It's been a few weeks and we are still arguing with them and trying to get out of this stupid contract because somehow we have hit almost 13 gygs in 2 weeks. We have purposely been staying off our internet and yet it gets higher and higher and NOBODY will do anything about it!
