Android on the iPhone
You can install and run Android OS on the iPhone, thanks to a tool called iPhoDroid. I’m not sure why you’d want to do this, but it’s fun to know that you can.
Personally I like iOS so I’m not about to run Android on my iPhone, but if you feel like giving this a go, then have at it and report back the results. If running it on your phone is too big a jump, you can always run Android in a virtual machine that’s preconfigured too.