Once upon a time, mobile phones had physical buttons. But don't worry, they didn't usually have many. To type a message (we called them SMS messages back then), you had to tap on each button multiple times until the correct character popped up on your screen.
Now, you can replicate that experience on your device!
To be fair, it can be helpful if you have big hands compared to the regular keyboard key size.
Whatever your reasons, Welcome To The World Of Yesterday!
