Don't know how to enable/disable the Airplane Mode (Android)

To enable the airplane mode, go to Settings -> More -> Move the slider next to Airplane mode to the right

To disable the airplane mode, repeat the previously-mentioned procedure, and move the slider next to Airplane mode to the left.

Press and hold the power button until a small window appears -> select Airplane Mode. Repeat the same procedure to disable the airplane mode.

Note: This solution applies to devices running Android OS versions older than 5.0 (Lollipop)

1. Swipe down from the top of the screen with one finger and tap the icon in the top-right corner, or swipe down with two fingers to avoid the notification area (depends on the model number and manufacturer of the device)
   
   
2. Tap the Airplane mode icon to enable the Airplane mode (on most devices, if the icon is colored white that means that the Airplane mode is enabled, if it's grey, then it's disabled)
   
   * The quick access menu's appearance is different from one device to another, but, the icons are the same as the ones shown below
   
   

   
   
   

To disable the Airplane mode, repeat the above-mentioned procedure.