History of Android.
- http://www.pcmag.com/article2/0,2817,2430130,00.asp
- https://www.quora.com/Why-did-Google-buy-Motorola-for-12-5-billion-and-sell-it-off-for-2-91-billion
https://www.youtube.com/watch?v=C_AvV1dELTo Android devices use Microsoft patents... we don't know which and how much they cost.