Also, don't forget the roles insurance companies would be playing. Who is going to _guarantee_ 400 odd different smartphones _might_ not cause a problem?
However;
If it makes you you others passengers any happier, rest assured that no operational flight crew will be allowed to whip out their own personal iPad and play "Words With Friends" below 10.000’ either....
That being the case - is there really any benefit to crew having these things?