(1) WiFi switch switches off the Wifi. Really. Plus the Bluetooth, and such - this puts it into airplane mode, which you can, um, use on an airplance. The theory is that it won't broadcast anything that disrupts the navigational system of the airplane. You can also use the switch to test if this theory is correct, but you might be arrested.

(2) The simcard slot has no function on the current machine, so you might as well use it for storing sandwiches, although they will have to be very small. Liverwurst, maybe.