The Micromax Canvas Nitro 2E311 is a good phone for every android user as it is a quick and faster mobile. I personally use this phone and its a easier phone to use, the features are easy as well as the function and the app of the calculator is a good one in this phone . You can both minimize and maximize it and can hold it any other apps as needed in order to calculate financial needs or something other else and with this you can find a 4.5 inch touch screen with an android version of 4.4.2 of kitkat .