You can still make emergency calls without network signal. When the phone has no signal from its provider’s network, an emergency call will automatically connect to the strongest network that it can find to allow the emergency calls going through. However, since it is not your network, you cannot make other calls.
basically your phone will find the nearest and strongest network aside from your provider if it’s an emergency call
in other words, an emergency call can use any kind of network available.
for more emergency-er communication where you’re stranded in a place without any network *at all*, like being away from civilization, there’s also satellite communication, but I think you need some special satellite phone for it since not all smartphones support this (CMIMW)
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