When Your Mobile Phone Falls Into Water or Any Liquid
Step#0: Take it out of water/liquid as soon as possible. However, if this situation occurs when you're charging the phone never insert your hand into the liquid or water or you suffer the risk of electrocution. Gently disconnect the charger from the wall socket and take the phone out of the water as quickly as possible.

Step#1: Quickly turn off the phone! Believe me this is the best thing you can do for your phone at that moment, because when you don't turn it off, you risk your phone operating at a very harmful condition. This will further deteriorate your phone's condition.

Step#2: Quickly remove the device's battery if you can. You can also remove your SIM card and TF card if you have any. Also make sure you remove any external accessories e.g headphones, earphones.... if plugged. This is a great measure to exposing the phone to dryness. You can clean the mobile device with a soft or smooth dry clean towel gently.

NB: When cleaning your mobile device don't attempt to shake the device violently or vigorously. This is a good measure to prevent and avoid the liquid getting deeper into the Phone's motherboard or control panel which may cause further harm to the phone.

Step#3 (Optional): You can also use the vacuum cleaner to suck and eliminate water in the inner parts of the phone. Make sure you don't get too close to the phone when cleaning with a vacuum cleaner because a vacuum cleaner is capable of producing static electricity/current which is very harmful to your phone especially at that point in time. Vacuum

Step#4: Since the battery is removed, you can dry the mobile device in a sunny area but not directly under sunlight! This practice is done so as to completely eliminate the remaining water hidden in the phone.

Step#5: After several hours or at least 48 hours of drying depending on your weather or atmosphere, you can couple your phone and turn it on. If it doesn't work then try charging the phone without the battery. If it displays charging and it works normal, you might consider changing your battery. But if it doesn't work at all you might also consider carrying it out for repair.

How to save your phone from damage by burying it inside rice
This feature of In-built battery is mostly for latest Android phones so I'll advise, if you're using a phone with In-built battery you can use this method.

You might be wondering "How does rice have anything to do with my phone?"
Actually, It's in the nature of rice to absorb moisture from any object placed in it

Why should you follow this method? You might ask.
In-built battery users are advisable to use this method

Since there is no means of removing the battery.
Since you can't afford to put your phone out in a hot condition. You know your battery detest heat a lot.
Your climate condition may not give you the necessary heat to dry your phone.
How to Use the Rice Method

Step#1: Get a good size of bowl big enough to contain like "five" of your mobile phones
Step#2: Fill the bowl to the brim with Uncooked rice
Step#3: Bury your phone with the rice
Step#4: You can place the bowl in a warm room to aid the process
Step#5: After 2-3 days you can remove the phone and turn it on
And if the problem persist you can visit a phone professional for repairs.

Safety Measure and Precautions to be taken
Remove the phone as quickly as possible
Don't operate the the mobile phone
Do not press any of the keys or button
Never turn the phone on rather, turn it off
Don't shake the phone
Clean the phone with a smooth dry clean towel
Don't blow air into it with your mouth
Don't dry the phone in direct sunlight

Credit:Learn Cell-Technology
https://learncelltech..com/2022/07/What-to-do-when-your-Mobile-Phone-Falls-Into-water.html