My 12 year old has been lording it over the rest of the family, for the same reason.
In the same boat (AT&T/Texas) but reversed, my wife's newer iphone was SOS but my older one was not. Her's came back online about 1:30PM central after being down since she woke up around 6AM central. afaik both my kid's phones were working, I'm sure i would have heard howls of anguish if not. Both of their phones are maybe 4-5 generations older iphones.