Q: Moisture damage to iPhone 4
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May 28, 2014 8:08 AMby Jason L,Hi Goron,
Welcome to Apple Support Communities!
Take a look at the article below, it will help you check the iPhone 4s for liquid damage and setup service if needed.
iPhone and iPod: Liquid damage is not covered by warranty
http://support.apple.com/kb/HT3302
iPhone and iPod: Liquid damage is not covered by warranty
If an iPhone or iPod has been damaged by liquid (for example, coffee or a soft drink), the service for such liquid damage is not covered by the Apple one year limited warranty or an AppleCare Protection Plan (APP). iPhone and most iPod devices that were built after 2006 have built-in Liquid Contact Indicators that will show (as described below) whether the device has been in contact with water or a liquid containing water.
iPhone and most iPod devices are equipped with Liquid Contact Indicators (LCIs) that are externally visible.
An LCI will be activated when it comes in direct contact with water or a liquid containing water. The indicator's color is normally white or silver, but when it has come in contact with water or a liquid containing water, it will turn fully red. An LCI is designed not to be triggered by humidity and temperature changes that are within theproduct's environmental requirements described by Apple.
To determine if the LCI in your product has been activated, find your product in the table below and locate the LCIs in your product. To help you see the LCI, use a lighted magnifying glass and angle the light or the device until you can see the it.
Note: If you are uncertain if your device has an issue caused by liquid exposure, even if an LCI has been activated, contact AppleCare or an authorized iPhone service provider for assistance.
The following table shows the location of the indicator (or indicators) and how they appear after being exposed to liquid:
Product Liquid Contact Indicator location iPhone 4 / iPhone 4s 
*Note: iPod nano (7th generation) and iPod touch (5th generation) do not have a visible liquid contact indicator.
If a device is exposed to water or other liquids, corrosion—an irreversible deterioration or degradation of materials—may result. This may cause the device to malfunction. If a device has been or is suspected to have been exposed to water or other liquids, inspect the following areas for evidence of corrosion: the dock connector, the headset/headphone jack, the dock screws, the speaker or microphone mesh, and any exposed metal parts. For example:
For further information regarding iPhone and iPod Service and Warranty, click the links below:
-Jason
