Quote Originally Posted by Arran View Post
There was a digital multimeter in the late 1970s. My electronics teacher at college once had one.

I'm sure that Clive Sinclair came up with an affordable push-button phone some time in the 1970s but Post Office Telephones would not approve it for connection to their network.
Before 1984 when BT was privatised, AFAIK most phones were hard wired with no socket. So you couldn't easily change phones anyway.

We moved house in 1984, and we still had the old type black phone with a chrome dial.

Sinclair had been going for some time though. My dad used to get electronics mags in the 1960s, and Sinclair used to advertise the "Sinclair Micro 6" a miniature, earphone only transistor radio back then.