[eertami]

But what if I as the user install software on my phone that isn't capable of calling 911?

I own the phone and I am able to install whatever software and whatever operating system I like. I don't want it to seem like I'm defending Google here, but should manufacturers really be responsible for the software someone installs on their portable computer?

[AlotOfReading]

Moreso than most, this regulation is written in blood. The reason this and other FCC 911 rules came about was that there were numerous cases of people trying to call 911 and failing due to software "issues". The FCC said enough and mandated that if it were possible to complete a call, the phone is required to.

Installing your own OS that intentionally doesn't support 911 handling would be in the "not possible" category just like a user who cut their antenna. For anything less than that, Google (and other manufacturers) are absolutely responsible for ensuring the 911 code path can't be disrupted. People have literally died from this.