Here's a development that means that means that wireless devices may be emitting radiation all they time when they're turned on, even in airplane mode.
'Apple users have unwittingly discovered a new feature after installing iOS 11 on their mobile devices: when you toggle your Wi-Fi and Bluetooth quick settings to "off" those services remain on for Apple services.
For example, Location Services is still enabled, and Handoff and Instant Hotspot stay on, even when iPhones and iPads are put in "Airplane Mode."
The change in iOS 11 has come under criticism because it could expose users to security risks.'
You can read more here.