Best answer: If your Galaxy S9's screen is just lightly scratched, you should be able to get by with just a tempered glass screen protector. For more serious cracks, you'll need to get it professionally repaired or try and replace the display yourself.
A screen protector might solve your problem
If your Galaxy S9 just has a few small scratches on its screen, the easiest (and most affordable) way to resolve things is with a screen protector. This will prevent the scratches from getting any worse and costs a heck of a lot less than sending your phone in for a repair.
Should you go this route, you'll want to make sure the screen protector you buy is tempered glass. Tempered glass protectors are a lot stronger than plastic ones and will do a much better job at keeping your worn out screen from getting any worse.
The Whitestone Dome protector linked above is one of the most expensive options out there, but it's also the best by a long shot (and still loads cheaper than having someone replace the screen).
If not, you'll want to visit a repair shop
For screen injuries that are more serious, such as deep scratches and cracks, it's probably in your best interest to have it repaired by a professional.
Samsung partnered with the popular repair company uBreakiFix to offer same-day repairs on phones like the Galaxy S9, allowing you to get in and out in no time at all.
For a Galaxy S9 screen replacement at uBreakiFix, the estimated price is $220.
You can also try replacing the display yourself
Alright, let's say you've got a badly damaged S9 display that a screen protector won't save but don't live near a repair shop. In that case, it may be worth looking into replacing the screen yourself.
You can buy a replacement display for about $270 on Amazon, making it the most expensive option on this list. It's also the riskiest, not only because you're going to void your Galaxy S9's warranty by doing something like this, but also because it doesn't come with any instructions. This should really only be considered if nothing else will work for you and you have the technical know-how to not ruin your phone for good.
The best protector
Whitestone Dome Glass Screen Protector
The best screen protector you can buy
$45 might seem like a lot of money to spend on a screen protector, but trust us when we say that it's worth every penny for the Whitestone Dome. This protector covers the S9's curved screen better than anything else that's out there and pretty much disappears once applied.
KR-NET Display Assembly Replacement
Install a brand-new display by yourself
If you'd rather replace the Galaxy S9's screen yourself instead of having a professional do it for you, this is the kit to get. It's expensive and doing this will void your warranty, but it is still an option worth considering.
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