Is Your iPhone 4 Warranty About To Expire? Here Are The Defects To Look Out For | Cult of Mac | How to Use an iPhone Well |

There are numerous reasons for taking the time to troubleshoot your iPhone 4. First, you paid for AppleCare.  Second, defective components may be signs of larger issues or may, over time, negatively impact other components. Third, if you’re thinking about selling your old iPhone 4 when you upgrade to a new iPhone you will get more cash for a replacement in pristine condition.