Project Sandcastle: Android for the iPhone Where sandboxes set limits and boundaries, sandcastles provide an opportunity to create something new from the limitless bounds of your imagination. Project Sandcastle is about building something new on the silicon of your hardware. The iPhone restricts users to operate inside a sandbox. But when you buy an iPhone, you own the iPhone hardware. Android for the iPhone gives you the freedom to run a different operating system on that hardware. Android for the iPhone has many exciting practical applications, from forensics research to dual-booting ephemeral devices to combatting e-waste. Our goal has always been to push mobile research forward, and we’re excited to see what the developer community builds from this foundation.