Fwd: Question

[german carutti]

Hello.
I am a teacher of hardware and software Argentina high school and yesterday
I was going to buy a cell phone, my main option was android, but I have
found that this system is corporate because you are not allowed to
modify, interact
with the root and also google can see who your contacts, calendar, where
you are and you do.
This agreement does not violate the use of free software?
No one would have units Alternative to this?
Thanks for your time.