That's why the passcode itself shares some of the blame here. For Siri to be both secure and useful when locked, we need new ways to access the phone. The face recognition in is a good idea. So is the thumbprint reader on Motorola's . In Apple's case, voice identification would be the best solution. It would allow the phone's main user to access any of Siri's voice commands even when the phone is locked, while requiring a passcode or some other fallback from other users.

In the meantime, I hope Apple changes the iPhone 4S's default settings to keep Siri locked behind a passcode.

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