Which of the following is NOT an Operating System for smartphones? UNIX Windows Phone Apple iOS Google Android

To determine which option is NOT an operating system for smartphones, let's examine each choice:

1. UNIX: While UNIX itself is not typically used as a smartphone operating system, many modern operating systems (including some derivatives) are influenced by UNIX principles. However, UNIX is not directly associated with smartphones as an OS.

2. Windows Phone: This is indeed a smartphone operating system developed by Microsoft that was specifically designed for mobile devices.

3. Apple iOS: This is the operating system developed by Apple Inc. for its mobile devices like iPhones and iPads, well-known and widely used.

4. Google Android: This is an operating system for mobile devices, developed by Google, and it is the most widely used smartphone OS.

Final Answer

The option that is NOT an Operating System for smartphones is UNIX.