We recently upgraded our phones to the iPhone 6 and only 9 days into the month we are getting a notice that we have used 75% of our data. We aren't using the new phones any more than we were the old ones so how could we have gone up this much? I assumed the new phones might use a little more than the old ones but we never had a problem staying well within our data on the old phones so how could it be up so much? Are there some settings we should adjust on the phones?