What should I do if the upper part of the iphone4s falls into the toilet and makes a popping sound?

Turn off the machine first and put it in a cool and ventilated place. Don't expose yourself to the sun!! Leave for a few days and allow the water to dry. One week is appropriate. It is strictly forbidden to turn on the machine in the middle of the process!!

Turn it on after a week.,If the phone is turned on normally, there's no problem.,If you can't wait so long, turn it off and send it directly to Apple after-sales service.。

After dealing with it yourself, you can directly find the after-sales service to replace the new machine Apple's after-sales service is repaired by replacement.

Open the back cover directly and use a hair dryer to blow it vigorously.

It should be a problem with the circuit board, it is recommended that you turn off the computer first, open the back cover, blow it down with a hair dryer, and use a cool breeze.