> Every phone I've had in the last decade has come with GPS (which includes altitude), giros and even magnetic compasses. So they can work out the angle of attack without the need for additional sensors, or at the very least a backup!

Pitch != AoA.

https://aviation.stackexchange.com/questions/2287/can-the-pi...

http://www.aerospaceweb.org/question/aerodynamics/q0165.shtm...