This is not exactly true the contract manufacturers are being paid to learn to make their own phones and they are.
http://www.wsj.com/articles/foxconn-aims-to-fashion-its-own-...
http://www.wsj.com/articles/foxconn-aims-to-fashion-its-own-...
http://fortune.com/2016/01/15/xiaomi-smartphone-sales-fall-s...