Is this photo, taken from a plane, illegal ?

[susaan]

Taken over Indonesian airspace,last month.

I'm asking generally,as we also travel by air internationally, ,and understood it was fine,since my camera has no wifi ,etc,abilities.
I would have put the camera away,had I been requested to do so by cabin crew - but none that saw me use it commented.
Can my camera really interfere with radar,etc ?
I hear all kinds of rumors about"only above 1000 feet","only if the cabin crew allows" etc,and would like to know where I stand,legally speaking .