Right, I noticed that for iOS unity is compressing my Textures to RGBA 16 bit and making it's filesize half, and likewise the atlas is being reduced to a 1024 x 1024 from 2048 x 2048 which I was using on BlackBerry.
Is there a way to get it back to 2048? I've tried a lot but nothing worked.
Also, on Blackberry 10 and Windows Phone 8 I am getting my sprites blown up to an undesired size.
Attaching a screenshot.