The Linux kernel is open source and so it is available for anyone to modify. The Android operating system uses the Linux kernel and modified it to fit their specific needs (as is the case with many Linux based operating systems). Because it is open source it is a common system to build off of. Programmers are not required to make their modifications open source. The fact that Android is a Linux based system is fairly common knowledge you can Google it.
The phone/OS you prefer
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The Linux kernel is open source and so it is available for anyone to modify. The Android operating system uses the Linux kernel and modified it to fit their specific needs (as is the case with many Linux based operating systems). Because it is open source it is a common system to build off of. Programmers are not required to make their modifications open source. The fact that Android is a Linux based system is fairly common knowledge you can Google it.