My phone only had 3 days has bright horizontal line across middle of phone screen noticed after final software update on July 10th. Did a factory reset still there. As it is whiteish line not sure if it is the screen or software issue.
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You can also take the device to a local youbreakifix location and see if they can determine what is wrong, and possibly fix it as well. If it is not accidental damage (drop, thrown into lava, etc) then you should be able to warranty replace it.