Huh, something like this happened to my mother's iPhone, too. She kept taking photos until the storage was filled to the brim. One day she had discharged the b

Huh, something like this happened to my mother's iPhone, too. She kept taking photos until the storage was filled to the brim. One day she had discharged the battery completely, shutting down the phone; after recharging, she tried to restart it, only to be sent into a boot-loop. There is no (official) way to resolve this except repeatedly reboot and hope that at least once, Springboard loads and you can immediately jump into Photos and start mass-deleting, or at least connect to a computer and transfer the media out of the phone.