If there is no Network How does an Emergency call work?
We know that we can call and browse the internet through mobile network.It is possible by the help of mobile operators tower and the signals from the tower.In some case we can’t get the mobile signals to the mobile phone.We see that when the signal is not the phone signal place sees Emergency call only.First how the mobile network works,
The network towers that dot the landscape are essential components of a mobile call. As soon as you press the ‘call’ button, your phone releases a signal and the nearest network tower will catch it. In the next step, these signals are transmitted to destination tower and finally to the person to whom you are making a calling. In this way, we are able to talk with another person through a mobile phone. The technology used by most smartphones is dependent on SIM cards which work on the Global System For Mobile (GSM) feature. GSM can use the network coverage of another service provider i.e signals from the nearest tower of another network service provider) in the case of a poor network. So when your network goes out, your phone can still make ‘Emergency calls” by using the network of another service provider. In many countries like the United States, it is possible to make an emergency call even during the improper function of SIM card.
How this work when there is no network.No coverage means no coverage for your sim card.An emergency call would be on any other mobile network of which you are in the range.But some case other network have no coverage how it is possible.The answer is not.The emergency number is different in different countries.911 is US and 112 is UK is the examples.
In short, any mobile using GSM standard works this way..
First : — Home Network , if not available then,
Second : — Roaming Network, if not available then,
Third : — Camp to network with the best signal in Emergency Mode, if not then,
Fourth : — ‘ No signal’. Meaning at a place where there is no signal at all.