I learned to code on a jailbroken iPod touch around 2009. I wanted to compile some random project for jailbroken devices, but I had a windows comp (with dialup!!!), so I was like "why not do it on the iPod itself?". I didn't even have wifi, so I'd sneak out of my parents' house at night and steal the neighbor's (hey, I was 11 w/ overprotective parents who would freak out if I occupied the phone line w/ internet) to go read up on compilers, jailbreaking, etc etc. Eventually I got a working compiler and toolchain, but when I went to compile the project I wanted to use (and not just a test project that I found), it spat out errors. So I learned C/ObjC on my iPod. Turned out the project I was trying to compile was a load of BS, so I implemented my own version and put it on github. From a fuckin iPod. Win. It was some SBSettings control. Once upon a time, you had to jailbreak to get those cool slide up/down menus with the toggles for wifi, bluetooth, location, etc!!!