iPhones are known for their security.
However a simple security flaw in Siri which allows almost anyone to make a call on a locked iPhone.
Remember that a lock on phones for a reason and thats to protect your privacy.
This video hack shows exactly why you should never allow your phone to get into the wrong hands.
Sadly, Apple ships iPhone with default setting on and Siri enabled.
Many iPhone users do not turn them off, even if they are never used.
Tap the Siri On/Off slider, under the Allow Access When Locked section, to turn it off.
This will stop anyone from accessing Siri while your phone is locked.
Resource :Mirror
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source: www.techworm.net