When there is no cellphone signal, how does the “emergency calls only” function works?

Question

When there is no cellphone signal, how does the “emergency calls only” function works?

In: 12

Answer 1

The phone companies have to let you use their service for emergency calls even if you are not their customer. So your t-mobile phone might not have connection to a t-mobile tower, but it can have connection to a verizon or at&t tower for this one purpose.