Apple recently announced four new models for the all new iPhone 12. This article discusses both the good and bad changes, along with anything else that you need to know if you're thinking about upgrading.
NOTICE: Not an official review, but an editorial piece.
iOS is a mobile operating system developed by Apple; it is a derivative of the Mac OS X desktop operating system, with which it shares many (but not all) common frameworks and other components. These include Cocoa Touch, the Mach/Darwin/XNU kernel and code from the Berkeley Software Distribution (BSD). Each iOS application runs in its own secure sandbox to prevent altering other applications, the operating system, or any other data.