Is Android operating system free?

The Android source code is free for anyone to download, customize, and distribute. This lets manufacturers build mobile devices at lower costs, giving people around the globe access to mobile technology that was previously out of reach.

Why is Android open source?

The Android Open Source Project (AOSP) was created to make sure there would always be a open source platform available to innovate the app market. As they have stated “the most important goal is to make sure that Android Software is implemented as widely and compatible as possible, for everyone’s benefit”.