Android 1.0 was a "gourmet" OS that provided advanced features far beyond the "fast food" mobile systems common at the time.
Android versions: A living history from 1.0 to 16 - Computerworld android 1.0 rom
Support for folders to group app icons and early versions of widgets , a feature famously absent from competing platforms for many years. Hardware and Technical Legacy Android 1
Unlike modern versions, Android 1.0 was designed for devices with physical hardware buttons and keyboards. android 1.0 rom
A rudimentary web browser (before the "Chrome" branding) that supported full HTML and multiple window "cards".