There was a time (before mobile phones) when I knew the location of every Casey’s and Hardee’s pay phone in Iowa. They were the only way to stay in touch with the office. Check for messages, etc. Here’s how I remember making calls from the road:

• enter 10-digit Sprint Card number
• enter 10-digit number of the person being called
• enter my personal Sprint number (10 digits?)

And while I couldn’t recite those Sprint numbers, I could punch in the numbers without thinking.