Yes, if your iPhone or any other android phone has been went into water then don't start immediately. Keep the Mobile in shut donw position only, don't even try to charge or start the phone by pushing start button.
Keep your Mobile in dry place or front of fan some hour.
Let the water dry itself then wait for 2-3 days and then visit your nearest service center to just clean the water inside.they will remove the water to avoide shorting in the circuit of motherboard.
This will save your iPhone or any other smartphone.
If you are living in ahmedabad, then for water damage phone you can just call us, we will help you and save your precius gadgets.