My i-phone 4 is dead and won't take a charge. I plugged it into a wall charger, if it wont turn on, is it the dead battery or something else. Can you make a call with the charger if the battery is dead. I want to know before I spend money on a new battery.
If you're still within warranty (within one year of purchase), you can go to any apple store and they'll most likely replace it for you, free of charge. If you're outside your warranty, I still recommend you go to the apple store as they can try to asses what's wrong with it and let you know whether or not you need a new battery or a new phone altogether.
Sometimes this happens and you can fix it by just holding both buttons for about 30 seconds or so until an Apple logo appears on the screen. If that doesn't happen then follow Ahmad's suggestion above.
Although rare, it could be a faulty charger or the usb data/power cable could be defective. You could try charging the iPhone from your computer via usb port to determine if the wall charger is at fault. If that fails, follow the above suggestions for returning the device to the Apple store. Bring the usb cable and wall charger so they can inspect these items as well.