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That depends on the resize algorithm being used, and on the factor. They could look pixelated instead of blurry, but it shouldn't be much worse than when displayed in a low-resolution device.
A 900px image in a 150ppi screen should look exactly the same when displayed at a 2x magnification in a 300ppi screen, same size, same quality. So nothing is lost by just enlarging all images to double size (in this case), but nothing is gained either, the images won't look "better" than in the low resolution screen.
If the magnification factor is not an integer, or if some interpolation algorithm is used for the resizing, then it can be blurry.
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