A rotary phone is an older type of telephone that has a circular dial instead of buttons. To make a call, you have to manually rotate the dial to each number of the phone number you want to call. Full definition
Building portfolios primarily out of domestic positions is like conducting business using rotary phones. (moneysense.ca)
It's kinda like opening a store selling rotary phones. (redeeminggod.com)
They developed an old rotary phone that they want to get into schools and libraries where book reviews are given right over the ear piece when you call into a special number. (goodereader.com)