The Emergency Number worldwide for Mobile is 112. If you find yourself out of the coverage area of your mobile; network and there is an emergency, dial 112 and the mobile will search any existing network to establish the emergency number for you, and interestingly this number 112 can be dialed even if the keypad is locked. Try it out.
Also in Australia , the Australian emergency number 000 can be dialed whilst your mobile phone keyboard is locked. This is another reason why 000 receives so many false emergency calls!