@Liamp972: If you dial *#0*# into your telephone keypad and select Red, Green and Blue from the series of grey tiles, can you see the line in any of these tests?
@Liamp972: If the issue is visible in the screen tests, and if you're concerned, then I recommend reaching out to our Help Desk via the link below, or on Facebook or Twitter, where an advisor will be able to look at this further for you, and arrange any necessary repairs. I apologise for any inconvenience this may cause you.
hmm, this is more or less when the bottom edge of the battery is....or the fingerprint scanner, which happens to be ultrasonic, maybe one of those things fried the screen,
and you don't remember it getting too hot? throwing it against a wall or driving over with a car?