Its a pink line ya? This is the same issue on my wife's phone...there is like NO fix, you can try to go into the diagnostics menu and see if it goes away..pretty sure it wont so its something with the screen. Most likely the warranty is also expired, so need a new screen..
Hey @vinay, if it's a coloured line like @SnowCat19 mentioned, then it might be due to a damage or crack in the display. This typically happens in the older phones. If the phone is still under warranty, then you should be able to get it fixed or replaced at no charge. Otherwise, you can still opt to reach out to your local Samsung service location and they will be able to help you (http://www.samsung.com/ca/support).
Hey Nick, I took my wifes phone to a cell phone repair shop, but they were not a certified samsung repair shop and he told me its due to the LCD. When you also press hard on the LCD screen, the line dims a bit so unsure. Her phone is out of warranty I advised her not to worry about it until and if she breaks her screen because the guy at the repair shop told us the only way to remove the line is to replace the lcd screen...not sure if its true or not. But very faint line, doesnt bother her too much :)
