Maybe you can share me link or tell me about datas on iPhone after upgrade to iOS 7?
I meen next:
I have app, which save data in .plist and send it ti iCloud (ubiquity container). So when we upgrade our device - can iOS delete app's plist or deleted datas in ubiquity container?
According to your comment: No application data (in the app or stored in iCloud) will be deleted or modified during an iOS upgrade. Apps run sandboxed and upgrade procedures do not touch the app sandbox.