Apple in its infinite wisdom has reserved the slow motion feature for the iPhone 5s, but there are now several alternatives. As discussed elsewhere, the app SlowCam is a camera app that creates slow motion videos on other iPhone models. Now there is another Cydia app, Slo-Mo Mod that simply enables that feature within the stock iPhone Camera app. I have tested it on my iPhone 5 and it works great, allowing the same slow motion effect management as in the 5S. Oh, and did I mention it's FREE?