Ever since upgrading to my iPhone 5 several months ago, I am averaging almost 2g of data per month (right at my limit), and that's only because I'm really careful about it and don't stream music, videos, etc; and I have wi-fi on most of the time. Before, I had an iPhone 4 and never had this problem - I probably used 500MB/month max. It seems strange that I lost my unlimited data plan when I upgraded to the iPhone 5 and consequently began having all of these issues. I cannot figure out where the excessive data usage is coming from. Please don't say I need to use the data less, because I promise that's not the problem. I use it the same amount as I did my previous phone. Is anyone else having these issues? Could it be a phone and/or operating system problem? Is it some setting I need to change? Please help!