I'm using this phone from last 3 years, got this with 512 MB RAM and 8 GB internal storage( 64 GB Expandable) and this is a single SIM 3G phone with 5 mega pixel rear camera( Camera quality is good), very handy phone with just 4 inches touch display, but the main thing in this phone is that the operating system is Windows 8.0( Upgradable upto Windows 8.1) . Little bit difficult to understand for those who are using android phone . We cannot do multiple task because it lags sometime and if you are the apps and game lover then this phone is not for you .