The operation of playing π on Apple's mobile phone is as follows:

Product model: iPhone 13, IOS 15.6. 1, input method.

1, long press the earth icon.

Long press the earth icon in the keyboard typing interface.

2. Click on the keyboard settings.

Click Keyboard Settings in the pop-up interface.

3. Click Add New Keyboard.

Click Add New Keyboard in the keyboard interface.

4. Click on Greek

Search in the search box, and then click Greek.

5. Click the arrow icon.

Return to the typing interface and click the arrow icon.

6. Click the π button

Finally, click the π button to type.