All cell phones with 911 functionality should have a way to periodically test that the 911 feature is fully functional. The reality is that I rarely even make a phone call anymore... but I don't even know whether being able to make a call implies 911 works? And I don't know if its still true but there used to be pretty significant fines for calling 911 so I'm not just going to dial 911 and say "making sure this still works!" The phone should just be doing various deadman switch type tests on the network/911 health-checks and report to me whether it is working or not working. It has a freaking GPS and can identify cell towers, so it should be pretty trivial to maintain test data and schedule. Relying on life-critical devices that can't be tested seems really sketchy.