iPhone 4 won't charge with wall charger after iOS 6 update After updating to iOS 6.0 my iPhone will not charge on the wall charger.  My phone will charge in the car and on a stereo dock.  My wall charger still works and charges my iPod touch fine.  I have even tried my husband's wall charger and my phone still won't charge.  When I plug it in the wall charger just starts blinking and my phone starts alternating charge/off/charge/off.  I have restarted phone, held home and power key, even updated to the new iOS 6.01 and still nothing!  Help!
Check the dock connector on the bottom for dust, and clean it out very carefully. 

The wall charger uses a different pin for the faster charge rate (12V I think), USB only carries 5V of power, and has a dedicated pin on the dock connector for 5V charging.