Enable Wi-Fi While In Airplane Mode
Submitted by Michael Johnston on December 27, 2008 - 12:48am.

One of the lesser-known goodies included in iPhone 2.0 is the ability to use Wi-Fi while in Airplane Mode. To do this, simply enable Airplane Mode and then switch on Wi-Fi. The orange airplane icon will stay in the status bar and Wi-Fi will be enabled.
Apple says that the feature is good for those on Wi-Fi enabled planes, but it may come in handy if you're in an area with no cell reception (such as basement or college building).

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also a good tip abroad!
Also as a note for those travelling abroad from the USA, don't expect your iPhone to work when you arrive in a foreign country. You have to call AT&T first to activate it and then answer some questions from their fraud department before it will work!
Or you could just unlock it and never have to make this phone call...
I don't get it.