Something I never knew until just now...
http://osxdaily.com/2012/05/24/use-airplane-mode-with-wi-fi-bluetooth-enabled-on-an-iphone-or-ipad/
This can be handy if, for example, you want calls to go straight to voicemail without ringing so that people think "your phone is off," but you still want to surf the 'net or play Words.
Or perhaps you need to maximize your battery life for surfing the 'net, and you simply don't need to have your cellular radio on.
http://osxdaily.com/2012/05/24/use-airplane-mode-with-wi-fi-bluetooth-enabled-on-an-iphone-or-ipad/
This can be handy if, for example, you want calls to go straight to voicemail without ringing so that people think "your phone is off," but you still want to surf the 'net or play Words.
Or perhaps you need to maximize your battery life for surfing the 'net, and you simply don't need to have your cellular radio on.