[Osem]

So presumably a backup phone with a SIM in it won't be usable for emergency calls if the SIM has been disabled due to it being inactive for 90 days or whatever. I wasn't too worried because of the 'emergency calls only' option which is displayed but I didn't realise is SIM dependent.

I'd wager a whole lot of folks have rarely used phones they think will be able to make emergency calls but won't, especially older folk like my MIL.