Always leave it on, but the manual actually says on page 38 'Note that the default settings will be restored when you
switch off the printer. However, this does not apply to the setting [Print/Point/
Reuse'. So not a bug, a feature:-)
WLAN is only established between the mobile phone and the printer! The printer also has a USB interface. A card reader is also integrated, so you can print directly from a memory card. If your camera is direct-print capable, the camera can also be connected directly to the camera for printing.