Wendywang

When phone screens are extinguished, I can no receive any message, including facebook, youtobe, instagram... I checked...

At the first, pocket lint is easy to solve, you can find many type of case have dustproof fution. Peplace the dock connector, but it is no easy job, iphone 8 is water proof, so if you replace it, you need to replace the lcd adhesive, anyway, after you open your phone, then waterproof is no good as new. If you need the products, you can check here, iphone 8 dock connector, lcd adhesive

If touch can not work well, in most cases you have to replace screen. But we can replace the touch/digitizer in China. But... iphone screen is very very cheap now, if your iphone screen is original, it is worth to repair, if cope then buy a new copy screen :)