Get the Whitepaper called Usability vs. Security: The Everlasting Trade-Off in the Context of Apple iOS Mobile Hotspots.
You can download it from the following link: https://packetstormsecurity.com/files/download/122054/hotspot.pdf
Source: https://packetstormsecurity.com/files/122054/Apple-iOS-Mobile-Hotspots-Usability-Versus-Security.html