How to ensure you never get another 'not enough storage' error on your iPhone again

You pull out your phone with just enough time to pop open the camera and frame the perfect photo before it's too late. Time is always of the essence when you're shooting real-life scenes and another second or two would have been too late. Your iPhone focuses, you snap the shutter button and boom... the dreaded "not enough storage" message pops up on your screen just as your subject vanishes. That's right, your iPhone was already full of photos and videos, and you didn't have enough storage to sa...