Micrmax Q391 Canvas Doodle 4 is the upgraded version of its former modle canvas doodle 3 there are some features in canvas doodle4 which have been changed from doodle 3 but some are not changed like if we talk about the display bothe the versions have same size of screen that is 6inch but some features are changed from doodle3 to doodl4 like new one have OS lollipop and 8gb internal memory expandable to 32gb and camera are upgraded its back camera is 8megapixel and front camera is 2megapixel but I dont like the features and it does not have so much features as I expected from it and its sound quality is also not so good it is just ok type. I will not suggest this for you if you are a techi like me and want to do different things on mobile simultaneously.