error
"Stallman has written in The Guardian that Android cannot be considered free because parts of the software are licensed under the ASF licence."
This is erroneous, at best; and dishonest, at worst. No where in the referenced article does Stallman say as such.
From the article Stallman wrote, referenced by this one:
"Google has complied with the requirements of the GNU General Public License for Linux, but the Apache license on the rest of Android does not require source release. Google has said it will never publish the source code of Android 3.0 (aside from Linux), even though executables have been released to the public. Android 3.1 source code is also being withheld. Thus, Android 3, apart from Linux, is non-free software, pure and simple."
The Android software is not free because the source code is being withheld. The use of the Apache licence does not, in itself, constitute non-free software. Indeed, the Apache licence is a Free Software Foundation approved licence.
I suggested the author recheck their facts; I have to wonder why there was no response.