Unfortunately, these lines indicate hardware damage. Depending on the mishap your phone has experienced, a variety of factors could cause vertical or horizontal lines to appear on your phone.

Vertical lines display when loading pages from Safari's "Top Sites" Topher Kessler MacFixIt Editor Topher, an avid Mac user for the past 15 years, has been a contributing author to MacFixIt since ...

I know this is an ancient thread but I made an account here just to let you know that I suffer from the same exact problem. Years ago I had a Lenovo IPS monitor that DID NOT have the vertical line ...

This won’t be 100% accurate but hopefully you will be able to understand what I mean, the real lines are much fainter and closer together, this image just emphasises what they look like.