Send short messages by mail.

Press * or # to update the input method when entering a short message. Generally, the mobile phone is the * key.

Look carefully at the modification of the input method on the screen, and you can enter it when you see ABC three capital letters.

There are 3-4 letters on a button. For example, there are three letters ABC on the button of 2. If you want to hit B, you can press 2 twice in a row, and if you want to hit C, you can press 3 times. If you want to hit a, just press it directly.