In a cellphone, what allows you make an emergency call even if there is no SIM card installed?
If a cell phone doesn't have a SIM card, how can it make emergency calls?
Can you make emergency calls with no network from lock screen, from mobile phones? Why might an Android phone display "Emergency calls only" when it can in fact make and receive calls? What kinds of phones don't have SIM cards? Can a phone work without a SIM card? Why or why not? Can you use a sim card for a mifi in a cell phone for calls too? Why does a cell phone say "emergency calls only"? What kind of phones have SIM cards? Can a cellphone be hacked by another cellular phone? What is a SIM card? Do all phones need one? Why can't I call 911 from my iPhone without service like other cell phones? Is there a way to make a phone call using an unknown number? Why can't you reach emergency (911-police) using a cell phone? How do cellular phones work? Why do phones need sim cards? Is it possible to lock a cell phone to only call/text certain numbers? What should I do if my Verizon phone isn't sending texts? Can a cellphone be hacked by a other cell phone? Why is cellphone called as cellphone? What is a cellphone? Will an iPhone SIM card work in an Android phone? How can I remotely access a cellphone? How can I get text and calls from other phones on my phone account? Is there a service for calling 911 online if you don't have a cell, landline, or paid VOIP phone? How does a cell phone get a virus? Is it possible to code on phone? Why is a mobile phone also called a cell phone? How does a landline call a cell phone? Is it technically possible to blast a mobile phone by calling from specific number? I have a new phone and SIM card with the same number, but I lost the old phone numbers. What should I do? How do mobile prepaid cell phone plans work?