As already mentioned, your landline is definately not on a Strowger switch, they were removed decades ago and the only one I know of is located at the BT museum of telephones at Amberly Chalk Pits Museum in West Sussex.
Like it or not OFCOM (NOT BT !!!!) have decreed that the ancient analogue system is to be replaced by an IP based system. This will, finally, eliminate the problems of caller id being spoofed whereby people of your age fall for the well known trick of believing that your bank is phoning you when they aren't. In fact the number on the back of your card is now NEVER used to contact you, even by your bank. How many hundreds of thousands of pounds have the banks been forced to hand out to people who have volutarily given away all their banking details, lost their money and then demanded 'compensation' ?
The chances of a power cut occurring just when you seem to think that you need to call a paramedic is pretty slim anyway. You can always get a cheap PAYG mobile for those rare occasions.
