yeah, no. Not every Wireless Phase 2 complaint phone will compute GPS coordinates fast enough for a quick 911 hangup. On silent calls, a "re-transmit" command can be used to see if coords are available. But the point is moot if agency policy, like mine, is to close out cellular 911 hangups or silent calls and to only attempt call backs. Cell phones, being mobile, are infeasible to track down as opposed to landlines. In the event of a traffic accident, most likely unless you are in the middle of nowhere and the person you hit is dead, there will be several other people with cell phones just eager to provide shoddy information about what they witnessed, but unwilling to assist on.