Why Did Old Telephone Numbers Stop Using Letters?

There was a time when telephones used to have letters as their keypads. Yes! Alphabets. For example, KA9-9900, KA9 being the area code or the street code. Or maybe, a company or any artist used to have numbered as 2-1500-PAINTER, or 8-1600-THOMAS. It made me remember the numbers more efficiently and with proper understanding. The … Read moreWhy Did Old Telephone Numbers Stop Using Letters?