How Emergency Calls Work, Even Without Network?

Nowadays most sim works on GSM, which allows users to use network of other service provider in absence of network coverage from their own service provider, but access will be limited upto emergency service.

In absence of a strong enough network coverage of your own services provider in your area, your phone get support from roaming network (these are those companies that have links with your own company).

If the roaming network is also not strong enough, then your phone search best network signal available in your area irrespective of its source company. Emergency calls can be made in this case. 

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