However, leaving your phone soaked in the sun isn't the best solution either. Water can cause rust on the inside of the phone. The rice phone trick will not always fix things either, and the damage will not become visible overnight. It's like all those times you left your bike in the rain when you were a kid; it took a while for rust to form, but when it did, it wasn't pretty.
The best thing to do is to get your phone repaired in a certified service center — it may sound like the typical IT answer, but it could save you a package, especially if your own DIY attempts go awry. If your phone was submerged for a long time or if your phone suffered a short circuit, you still have options. Apple accepts water-damaged phones as part of its redemption program, although you'll have to have moderate expectations about how much money you'll receive in a gift card in return. Waterproof means that a device is impervious to water for any time, while water resistant means that a given device is rated for exposure to water for a certain period of time and to a certain depth.
The first step in repairing a water-damaged phone is to do your best to get the phone out of the water as soon as possible; the longer it stays in the water, the more it will be damaged. Instead, if you want a little heat to keep away anything that the water hasn't dissipated yet, consider letting your phone rest on a window sill in sunlight or using air in a can to expel water. Therefore, the best thing to do when your phone is damaged by water is to visit the repair center and let a specialized technician access the problem. When water enters through these holes, it goes directly to the internal parts of the phone, and that's where it damages vital components.
However, the motherboard is not the only component damaged when the phone comes in contact with water. For starters, SIM and SD card slots, headphone jacks, charging ports, and microphone holes are the common entry point for water to damage the phone. Even more, try not to dry the water with a heater or hair dryer, as they could damage the screen and other internal components. Turning off the device ensures that water does not reach or damage important parts of the phone while the electronic devices are active.
Just be sure to read the fine print to make sure that the insurance policy covers accidental and water damage.