Personally, I'm now more of a stay-at-home type person so have no need for a smart phone. However, there are those who think the American Express slogan, "Don't Leave Home Without It", applies to their iPhone or other smart phone, not the credit card. There is a security issue users of the voice-activiated personal assistant, Siri, included with the new iPhone 4S need to be aware. As explained by Graham Cluley: Whoa! Not good. See the full story at the source, including instructions to disable Siri when their phone is locked: Has Siri left your iPhone 4S unlocked?