sometimes it depends on the camera the photo was taken on. one of my cell phones I have to have the cell phone vertical. and with the other I have to have the cell phone in horizontal when taking and uploading pictures.

when you take pictures with your cell phone try holding the cell phone vertical and horizontally while taking a picture of the same object. then upload those pictures and then you will know which way to hold the cell phone to get the picture you want.

some cell phone camera's also have various settings on them, like filters, apertures, zooming lenses, landscape, panarama, portrait and others, brightness, and whether you want inverted, regular, negative, positive and so on. so check your settings when in camera mode. play around and you will find the right settings for you and the kinds of photos you want and how you want your photos to look like.