Why does the read needs charging symbol keep flashing? (iPhone 4s)?

I've had my iPhone 4s for about two months. I dropped it once and it smashed, but it seemed fine for the next few weeks, until today. It might just be the charger, but when I plug it in the red needs charging symbol flashes. If I unplug it, it obviously turns off.

please tell me its not the phone?

Added (1). Why does the red "needs charging" symbol keep flashing? (iPhone 4s)

It's obviously the phone. What else would it be?

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