Thanks! That's 3/4 down this thread and you're the first NOT to talk about looks or tight jeans, but about the actual problem!
Phones are designed to male emergency calls easy - for exactly the reasons you noted. You may have to do a silent call or have an arm and a leg torn off and still need to be able to dial 911. Anything that makes it harder for your butt to dial 911 makes it harder in those situations, too.