Airlines will not allow you to have your cell phone turned on during flight due to supposed interference with their instruments (a worthy safety measure), but is it against the law? If I am flying a single engine airplane, can a passenger use his/her cell phone if I am flying VFR?
If cell phones DID interfere with instruments, what instruments would be affected? I can’t imagine your airspeed indicator or attitude indicator would have any issues. What about the OBS/Nav radios/GPS?
An additional comment on this from a non pilot…If cell phones DID interfere with your instruments, wouldn’t you be able to tell?