How to type the pinyin of mobile phone messages for the elderly?

After the old people enter short messages on their mobile phones, press the "#" key or the "*" key to set the pinyin input method, because different mobile phones have different switching methods. The specific settings are as follows:

1. Press the "#" key in any text input box of the mobile phone.

2. When the Pinyin icon appears in the page, the Pinyin input method is set.

3. Enter the corresponding pinyin to print the text font.