Sony Xperia Z3

Researchers found that Coolpad Group Limited, the sixth largest smartphone manufacturer in the world and third largest in China, had installed a backdoor into their phones and had gone to great lengths to keep it hidden from users.

Iterative products are just a way of life these days. We get a new slightly updated device every few months, sometimes every six months, sometimes even every year, Sony have mastered the iterative product cycle, releasing new products every six months ensuring they stay current.