Galaxy S4 SGH-i337 16GB Black Mist (AT&T)

the screen is discolored on bottom left (not sure why as i purchased it from someone else like this) Also the bottom center home button doesn't work (think the spring is broken? But not sure what the problem is) The software seems works fine, every now and then the touch screen has to be pressed hard for it to identify the touch, but this happens mostly in the center of the phone (again like this when i bought it). Someone who wants to buy it and repair the screen and home bottom button should consider this. Or those buying for parts. I cannot guarantee this product as i don't know why the screen is the way it is. please see attached photos. The last one shows a little bowing out of the frame if you look closely. I rely recommend buying for parts or buying knowing theres work to be done