Follow the below steps to fix a water-damaged phone:

1. Assess the damage: Immediately remove the phone from the liquid and switch off the power. Then, take off any external covers and wipe off any excess moisture with a cloth or tissue.
2. Clean the phone: Use a soft cloth and an isopropyl alcohol solution to gently clean the exterior and any ports or trays.
3. Leave it to dry: Allow the phone to air-dry completely. Do not use a hairdryer or attempt to wipe it with paper towels as this may cause further damage.
4. Test it: Try turning the phone back on. If it works, you should be careful, as the water may have caused damage that is not yet visible.