I've worked on some custom Android firmwares before, and I did this for our releases. It's easy, the 911 call center doesn't mind (it's scheduled beforehand), a

I've worked on some custom Android firmwares before, and I did this for our releases. It's easy, the 911 call center doesn't mind (it's scheduled beforehand), and it ensures that the phone can dial 911. If you can't manage to test emergency calls, don't release phone software.