[rurban]

Because swooping up all mobile audio and transmit it over would be a management decision, certainly not engineering. This is what most likely drains the battery and your data plan. You cannot explain this amount of drainage with CPU only.

Also swooping all kind of privacy data, like call logs, messages, contacts, calendar info is from management. Engineers really know better that this will be found out sooner and later, and then it's the end.

[goalieca]

There's subtle exploits out there that efficiently manage to Hot-mic a phone and still use less battery than facebook.