1) 112 is a worldwide emergency number for mobile. When you are out of coverage you can dial 112 and device will automatically search for existing network.
2) To avoid being "Blue jacked" (sort of hacking via bluetooth), it is advisable to keep your bluetooth OFF or set mobile phone visibility to hidden when not in use.
3) Most of the time we use mobile phone for just seeing time. If your mobile is locked, just press the on/off button to turn on your backlight to look at time without having to unlock the keypad when it is dark. It also saves battery.
4) Always enable phone lock and PIN number on your SIM card to avoid unauthorized use of your mobile phone & SIM.
Note: A little carelessness can be dangerous for you. So take care!
