I THINK (Man I could be wrong on this), that phone cameras are made to take pictures only in Landscape mode, not Potrait mode. So if you are holding the camera with the top of phone as UP, it would rotate the picture when it stores it. Try holding the camera part of phone sideways, in Landscape mode, and take a picture......then post it and see if it comes out straight.

I am NOT sure of this. If wrong, just ignore this, but prolly worth a try.