How to track large data usage by apps on iPhone 17 Pro?
Recently I noticed large amounts of traffic through my iPhone 17 pro, so I am wondering how can I track which app or service is transferring so much data?
iPhone 17 Pro, iOS 26
Settings > General > iPhone Storage - look at the data used by each app on your iPhone.
You can also open Settings > Cellular > Show All - see each app and how much cellular data is consumed.