A vulnerability in iOS 4.1 is allowing people to make calls on a nominally locked iPhone 4, users note. Passcode-protected iPhones typically block most actions unless a person picks Emergency Call and dials a genuine emergency number, such as 911. Circumventing this on the iPhone 4 can be done by entering a non-emergency number from the Emergency screen, tapping Call, then immediately hitting the lock button. The action brings up the Phone app, where people can then access a contact list or manually dial any number.
