BYOD, as in Bring You Own Device, hence buying and importing phones that you wouldn’t typically see on a Telstra plan.
Whether or not a device can actually support VoLTE unfortunately actually has very little to do with what is and isn’t being blocked; even the industry itself doesn’t know what 100% will and won’t be affected, as there are devices that are told to be ready for post 3G shutdown, but in testing they are not emergency VoLTE ready, and so will not be able to make emergency calls after the shutdown, and no matter what you put on the phone, if the IMEI number isn’t on a compatible registry, that phone will be blocked.
I do highly suggest reading the article, as it does go more into depth on everything (as well as the Change.org petition). I am “tech aware,” to a degree; however, I am not at all well knowledged, just something I genuinely very much feel needs to be shared.
Work for a somewhat expensive automotive brand and yes it is very common. We have cars from $60k to over $400k and beyond, and they all are glued together everywhere you look, that or plastic clips, very little is actually bolted on. Sometimes because in a crash it is better that a piece breaks and fly’s off then to stay mounted to the car, and in (most) other cases, probably for cost reasons. But it is a common thing, and has been for a long while, and if executed right, it is tried and true, however if you don’t have good quality control and workers who don’t care, they’re not gonna mount pieces right, and create a hazard