FlaFyrFyter, we have just the information that you are looking for. Getting the usage details on your phone lines is key. The detailed usage log will show you how much data, minutes or messages were used and when. You can view usage for your current bill cycle and also for past bill cycles: https://www.verizonwireless.com/support/view-usage-on-your-bill/ and view the section labeled: " View a detailed usage log for each line" for the information that you are looking for. Please keep us posted if you have more questions.