How to recover from water damaging?

My phone is being dropped during bath and it was a bad news for me. My brother dropped it and now feeling hesitation whether there's any process to recover from damaging.
N.B: It is iphone-4

Quickly put it in rice, leave it there for a while.unscrew back off if possible (don't know if iPhone 4s have screws) it should help absorb the water. May not work but you should do it.

Put in rice, group of mini chinese will come and fix it.

Once the SIM card is removed you want to put the iPhone in an uncooked bag of rice. Tighten the bag so all extra air is gone and seal it.
Wait 48 to 76 hours after the water exposure and then try it out. If you find at that time it is not functioning properly as a result of the iPhone water damage put back in the rice and check local customer care.