Is it really necessary to turn everything off when flying. According to DJI 2S FAQ:
How can I improve the signal receiving quality of the DJI Air 2S remote controller?
The remote controller antennas are built into the mobile phone holder. Please adjust the antenna direction according to the position of the aircraft. For more information about antenna directions, please refer to the User Manual.
In addition, do not wear any wearable devices with information transmission function during flight, and ensure that the mobile phone wireless network and Bluetooth are turned off to avoid interference with the aircraft's image transmission signal.