Some SCADA stuff that monitor powerlines and water utilities and all are super old, those working with 3G modem are being replaced at least, it is sometimes 20 years old technology without security. For instance it reports by SMS and you send SMS to it to execute commands and all.
They broke support, for the username, maybe 20 years ago, my username was "Frédéric54" but after a slashcode update I was unable to log, I had to contact CmdrTaco to debug this and it was because they broke accented characters badly. Taco had to rename my username in the database...
It seems not, because IIRC my Pixel 10 says that even if for instance a thief steal my phone and shutdown it, it will still be traceable for a few hours.
This is really sad, I started with Arduino in 2007 or something, you just needed an ATMEGA168 and a few component around and you were in business. Add some sensors, inputs, a 16x2 LCD, and you could do a lot of fun things:)
Now they propose something like a rPi ?!?
I am using Public Mobile and my Poco F3 is not in their whitelist but I can "bypass the carrier check" and have VoLTE, it works fine. A lot of carrier can be bypassed.
But some like Rogers or Fido will block your IMEI or charge you 75$/month if your phone is not in their list, this is unacceptable.
In Québec this is our first phone-free school year too, I know some parents and children want to basically strike and protest, because helicopter parents will not be tethered anymore...