A customer calls to tell you that her iPhone was stolen and that she is very concerned about the data on the phone being accessed. When you question, she tells you that the phone is running the most recent operating system. What suggestions do you have for her?
If there is passcode enabled then its data is automatically encrypted.
iOS 8 and later automatically encrypts data using the phone's login. The phone should be safe as long as the person who has it does not know the password.