We are having problems with data usage. One of our phone lines shows almost every morning between 1am and 4am that data is being used, but we are both sleeping. It only happens on one of the phones. Also on this phone, when the phone is connected to wifi to go onto the internet, there is data usage being shown again. Why does this happen? The only time the phone uses data knowingly is when an email comes in and it is quickly answered or picture mail.