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According to one of the Nokia booth attendants who was promoting the and X+ and XL as part of Nokia's business device range, the version of Android that Nokia's platform was built on is 4.1 — the first version of Jelly Bean Google announced back in June 2012. Nokia's forked version of the OS, however, goes by the name of the "Nokia X software platform" and it's currently at version 1.0.
While the UI is inspired by Windows Phone, the tiles are more like rows of apps that lack anything to visually separate each one. And, while they're not live like the tiles in Windows Phone, Nokia X gets around the problem using Android's widgets to mimic the live tile concept — as shown above on the X.
These can be initiated by long-pressing an icon, which brings an icon at the bottom of the screen that leads to a list of apps available as widgets — for example, contacts, email, and Facebook. This part feels very Android.
Touching the icons or other actions like using the backwards arrow is a bit of a hit and miss experience.
Nokia has also added its own gesture modifications for its keyboard and provides a set of instructions explaining how to quick copy, cut and paste, add punctuation, or change the case of letters.