If you select your sprite in the project view, the inspector should show you import settings for that sprite. Near the bottom, there's things like compression and also resizing. Typically, if either dimension of your sprite isn't a perfect square (8, 16, 32, 64, 128, 256, 512, 1024, etc) unity will resize your sprite. I'm not 100% sure this is the problem though. I suggest you do a build where you throw in a mesh or something that you know will render perfectly, and if that is also being pixelated, then it might be more likely to be something related to platform-specific quality settings like aliasing artifacts (which I believe are under Edit>Project Settings>Quality)
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