Jordan Turner: Wave it, wave it, wave it.
Casey Welson: Mom. Mom, you were always the perfect mother. You gave me everything that I ever wanted. And I love you. I love you so much. And I'm really sorry. Please don't ever forget me.
Officer Paul Phillips: Double check, quadruple check, triple check. He does not get through this point, all right?
Jordan Turner: Casey, what's happening?
Jordan Turner: And don't make promises... cause you know you can't keep'em.
Answer: Not if you have absolutely no signal, no, you can't. Mobile phone companies generally have an agreement that any network will carry an emergency call, even if it's not the network that that phone belongs to, so if you were out of range of your own network, another could carry your call, but if you're in a situation where none of the networks can reach you, by definition no calls of any kind can be made.