Monday, July 06, 2026
Old SIM Cards
I was surprised how different the SIM cards were. Within a supplier and a period of time, they are similar, but over a longer period, or across supplier and the differences were greater than I expected.
I imagine some of the emergency behaviour is very similar, but little else.
It is as if the early ones were very much structured and standard, and the later ones were unstructured, or at least structured at a higher level.
My understanding is that level 3, is dead in this country as a service. It might degrade to level 2.
I doubt if any are level 4.
I also don't know if an old machine can be used in other ways with other connections.For instance connecting to the internal BT network.
M
