[raybbr]

you cannot hang up a cell phone from a 911 call. but you can put it down. probably wise to cover the mic

Of course, you can hang up. Why couldn't you? Is there some law that requires you to stay on the line?

[Chickensoup]

you cannot hang up a cell phone call to 911. The technology does not permit you to initiate the hang-up. Only 911 can hang up the call.

True.