Jailbreaking your iPhone is the norm nowadays. I’m pretty sure no one with an iPhone would be caught dead without some sort of third-party application installed. If you’re a fan of keeping it simple or kicking it old school, check out iDial, a rotary phone application for Apple’s Jesus Phone.
Add it to your iPhone and you’ll be able to relive the 1950s all over again. Dial a 4 with an exhilarating swipe of a finger. Fun. Just don’t try dialing whilst riding your bicycle.