The Xperia C runs on Android 4.2.2. The operating system is both intuitive and smooth was well as easy to use.
The Samsung Galaxy Grand Duos (Review) natively ran Android 4.1.2 (Jelly Bean). The Samsung Grand DUOS uses Samsung's own Nature UX interface. This interface can also be found on the Galaxy SIII and Galaxy Note II devices for example. However, due of Samsung's own system requirements, the company had to downgrade it's Nature UX version a bit to make it run smooth on the Galaxy Grand. One such smart feature that the phone does have is Smart Stay which you can use to detect if you're using the device or not by monitoring the front camera. Another feature is multi-window. Due to its big size, the device can easily open two windows at the same time.
The Nature UX used on the Galaxy Grand has a homescreen, menu and widgets. This is the same as for the other devices using the Nature UX. The widgets are resizable in both width and height. Once you get several apps running, you can use the task switcher to go back and forth between them. It's a Jelly Bean-style vertical list with a screenshot and a name for each app. Swiping an app sideways removes it from the list.
An interesting feature of Grand Duos UI is the dual-SIM interface. The feature allows you to select which SIM card you wish to dial numbers from (which displays as a number on the taskbar), as well as which SIM's data service network to use. You can also quickly switch between both SIM cards from the notification area.
