system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can my mobile make emergency calls when it has no signal?

1st post, thanks for reading!
gpt
It may not have signal from your carrier, but it may be able to pick up signal from another carrier, which is allowed only for emergency calls.   This other carrier won't show up on your cell phone's signal meter, but it will allow you to place an emergency call.