The image above shows the same device in the Microsoft Intune administration console. Notice that the device shows only the apps sent to the device by IT. Facebook, Instagram, Netflix and more are not shown and are unknown to IT since they are personal apps installed by the employee.
Calling and web browsing history
Email and text messages
Contacts
Calendar
Passwords
Pictures, including what's in the photos app or camera roll
Files
Device owner
Device name
Device serial number
Device model, such as Google Pixel
Device manufacturer, such as Microsoft
Operating system and version, such as iOS 12.0.1
Device IMEI
Managed app inventory and app names, such as Microsoft Word