The term 'iPhone Alternative' can be summarized by two crossword solutions: ANDROID (7 letters) and DROID (5 letters). ANDROID is an operating system developed by Google for mobile devices such as smartphones and tablets. It is the most popular mobile operating system in the world, with over 2 billion active users. DROID is a line of smartphones and tablets developed by Motorola Mobility, a subsidiary of Lenovo. It is designed to run on the ANDROID operating system. Both ANDROID and DROID are popular alternatives to the iPhone.