How to curl hair with a flat iron or curling iron is really easy once you get the hang of it. The difference between curling with a flat iron and a curling iron is that the curls last longer. Your curls will have a slightly different shape than the traditional curl with a round barrel iron. The first video shows you how to do just that. The second video is a really interesting technique if your want to make your hair soft and wavy. She uses her curling iron and her 99 cent granny rollers to create this effect!