After many experiments, we’d moved as many keys as possible off the main layout displaying the letters, devoting the reclaimed space to making individual letter keys as big as possible. Even then, a typical finger covered between two and three letter keys. In our final design, we made punctuation and numbers available under a separate layout accessible by tapping a .?123 key. We worried there would be howls and complaints about the inconvenience of this arrangement, but it turned out to be one of those things that people adapted to readily and accepted without much fuss.
