It used 2.5 GB of mobile data without my permission! My issue with this is that I have WiFi in my home and I never left and my internet never went down. I'm handicapped and on a very tight budget. My income doesn't allow for the price of unlimited WiFi so I get 5GB a month in case I leave home and need to use phone or internet. Even worse is the fact that I was never notified about the app switch to mobile data. I would have changed it back to my WiFi or if offline, waited until it was back up.