One of the new “features” of iOS 6 is that you can make phone calls, send emails, compose and send texts, search Google and send the results to a contact — all from a LOCKED iPhone. While this might be a great convenience and useful feature for people on the go, Siri can’t yet distinguish between voices. So if anyone gains physical access to your phone, holds down the Home button, and tells Siri to send a letter of resignation to your boss, your iPhone will happily comply.
To disable Siri access on a locked phone:
- Tap Settings.
- Tap General.
- Tap Passcode Lock and enter your current passcode.
- In Allow Access When Locked, in Siri, slide to Off to prevent Siri from being activated when the phone is locked.