<ul data-eligibleForWebStory="true"><li>The rise of smartphones with touch keyboards made that input method popular, but for key-limited projects, consider using the libt9 library from FoxMoss to emulate touchtone typing.</li><li>Old flip phones used telephone keys for typing, with each key corresponding to multiple letters.</li><li>There were two methods for using limited keyboards, one requiring multiple key presses to cycle through letters, while the T9 system recognized words.</li><li>The T9 system predicted words based on the key sequences inputted, making typing faster and more efficient.</li><li>The libt9 library knows around 75,000 common words to aid in predictive typing.</li><li>A website is available for trying touchtone typing if interested in experiencing the old input method.</li><li>The old Blackberry keyboard is praised for its physicality and ease of typing.</li></ul>

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