Yes, but even then it was generally only true for the remaining fixed landline phones. Felt just like a public knowledge part of your address, like putting your name on the doorbell button.

To be generally valid for mobile phones you probably would have to go back another 10 years.
Those truely were different times still, also online.
I even remember posting my mail address to a public register at the end of the 90s to distribute the public part of my pgp key...