We're very sorry to hear that.
When you upload an image onto Slidetiles, we do not decrease the quality or edit the photo in any way before printing. So what you upload is what you get. Unfortunately, it's impossible for us to further increase the quality of a photo that we receive.
When you view an image on a smaller screen (like a phone) they tend to look sharper vs looking at them on a larger screen.
To see the true quality of the image you have, a good test is to zoom way into one area of the photo that has some detail (like someone's face) and see if its blurry. If the image is lower in resolution or quality, the details will begin to blur.
Most images you take using your phone camera will look great on a Slidetile. But beware of photos you may have received via text message. Many times the quality of those images is reduced to speed up sending times.