I too am having issues with Data Usage on my iPhone5. It started this summer. In the past I have never used more than 1G of my 2G plan. Now every month I am using 75% of my data. I even have a Verizon hotspot card that also used more data then ever. I thought it was because I was in the northern part of the state where service is not the best. However even in the city I am using way more data than ever!. I have checked all my settings, which are the same as before and it does not change my data usage. Also there is no settings on the Verizon card I can change. I do not watch videos or play music. I don't understand why in the last 8 months this has been an issue. When I called Verizon this summer they just told me I needed a new plan. That was NOT the answer. Something is going on and it needs to be fixed. I am a long time Verizon customer. Their coverage area is great for where I travel, but I can not afford the data!!