Water damage is a serious problem for an iPhone that needs to be addressed as quickly as possible. Otherwise, that can lead to serious damage to your phone. Professionals use Liquid Contact Indicator (LCI) to make sure does your iPhone gets damaged by water or not?

If the LCI turns RED, your iPhone has damage.
The LCI will appear WHITE or SILVER if there is no damage.
The LCI also may appear YELLOW if there is no damage.

Why do you need professionals to repair iPhone water damage?

Professionals use the right tools to repair the damaged iPhone
You will get a guaranteed job from experts
For getting a quick solution, there is no better way rather than holding the hand of skilled technicians

Problems that can occur from water damaged iPhone is:

The phone won’t turn on: If your iPhone won’t turn on, it may have short-circuited after coming into contact with water. After facing this kind of issue make sure you have been checked by professional repair technicians.
Prevent health hazards: Professional repair shops have a team of competent technicians, who have vast experience repairing water-damaged iPhones. Experts efficiently repair and replace all the damaged parts and ensure your iPhone returns to life again.
Overheating: After facing water damage speakers may not work, or not work correctly.
Display issues: If you notice dark spots and lines appear on the display. Professional repair technicians ready to fix display issues effectively and efficiently.
Charging problems: Water damage can cause charging issues. If you are looking for your nearby experts, this writing will hopefully help you get the assistance of certified professionals, who have experience in fixing the job.

For more details: https://itechxpressinc.com/apple-iphone-repairs/