Pasted from Wikipedia 112 is a part of the GSM standard and all GSM-compatible telephone handsets are able to dial 112 even when locked or, in some countries,

Pasted from Wikipedia 112 is a part of the GSM standard and all GSM-compatible telephone handsets are able to dial 112 even when locked or, in some countries, with no SIM card present. It is also the common emergency number in India and in nearly all member states of the European Union as well as several other countries of Europe and the world. You can dial it in the US too..