I just recieved an email from ATT stating the data charges are valid and there is nothing they can do. I'm on the phone with them now. Somehow from 9am to 12AM. My iphone ate through 27.4GB on 4/3/17! I have a 30gb plan, and I generaly use 8-15 in a month. I'm 39 years and I sold phones for 15 years, so I'm not a newbie. I know how to control data usage. I was at work from 6pm to 11pm. ATT shows data usage in 3 hour chunks. And it states from 6-9pm i used 10gbs of data! I wasn't on the phone at all. I was working! I'm pissed. Has anyone else gone through all of their data after upgrading to 10.3?