As for Iphone4, the operating system is normal, but there seems to be water stains on the screen, and the brightness is different from other places.

It's a pity that your mobile phone was wet by water. There are three ways:

The first type: open the back cover of the mobile phone, and then dry it thoroughly with a hair dryer. The way to open the back cover is to unscrew the two screws on the bottom of iPhone 4. After unscrewing the screws, push the back cover upward with both hands. This process needs to be very careful, otherwise the shell of tempered glass is likely to be damaged. See/166/544 _1654056.html for details.

Second, if you don't want to open the lid, you can buy a drying box and an electronic regenerative water-absorbing card (around 200 yuan) in the photographic equipment store, and put your mobile phone in the drying box for a few days, which should have a good effect.

The third type: if you don't want to do it yourself, go to the Apple Maintenance Department for repair.