I have an iPhone 6 running iOS 10, and I also have an iPhone 7 set up as another iPhone which is also running iOs 10. I can't download the enhanced siri voices on either of the iPhones? If I remember correctly in iOs 9, you could use the enhanced siri voices as voiceover voices. So how can I download these under iOS 10? They'd make MIGHTY NICE options for reading books in voice dream reader. Any help would be appreciated.