Delaying a flight over this shows how much technical ineptitude is there.
It also shows, however unfortunately, the futility of trying to protect everyone against everything all the time. Who needs to blow themselves up, or even risk the explicit criminal sanctions you'd face for making a bomb threat, when you can just co-opt some unwitting and otherwise innocent traveller's personal device somewhere outside a travel hub or other likely target for an attack?
If our threshold for fear has become so low that some kid's not-so-funny practical joke can now result in several hours of delays to long distance transportation, then apparently in a very literal sense the terrorists have already succeeded. Next you'll be telling me we spend time and money prosecuting angry travellers over tweets sent in frustration when airports are closed.