Bell called TI in a panic: why the calculator keypad is the exact opposite of the phone's
mkheck · x · 2026-10-12
A classic tech anecdote: after Texas Instruments built the first electronic hand calculator, Bell Telephone called in a panic. Bell had run extensive tests to find the optimal keypad layout for push-button phones (1-2-3 on top), and seeing TI's calculator use the exact opposite arrangement, they assumed they had blundered and asked what TI's tests showed — only to learn TI never tested anything. The quoted "Tests? 🤣" lands the punchline: sometimes intuition beats exhaustive validation.
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