I knew some of that, but there was a lot in there I did not know.. Thanks for posting...
By the way, you can also use 112 on landlines. I found this out accidentally when I worked in telecoms, and on one site, instead of having to dial "9" to get an outside line, you just dialled external calls like you would at home.
To make an internal call you had to dial "8" before the extension number, and unfortunately no one told me this. To make matters worse, the person I needed to speak to was on Extension 112, and I had the shock of my life when I was answered by the emergency operator. I Apologised, and hung up, and tried again, only sods law I got through to the same person, who had no sense of humour, and told me off... I did finally managed to explain that I did not understand why I was getting through to them, as I was dialling 112, and that was when they said that 112 was the new number for the emergency services...