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Ahhh, it was the old analogue phones I was thinking of. I never had one, my brother did though. I remember the big sim card and the perforated ones too :)
by kamjam 15y ago
Ahhh, it was the old analogue phones I was thinking of. I never had one, my brother did though. I remember the big sim card and the perforated ones too :)
- dfox 15y agoAnd while NMT phones didn't use easily (and user) replaceable SIM, they were paired to operator/number not by some database but by contents of replaceable EPROM chip in them. SIM cards were introduced not to make changing carriers possible, but easier and also more secure (NMT phones could be cloned without direct access to phone, only by eavesdropping on signaling channel).