Is there any software that can write on the mobile phone screen and put it on the desktop or lock the screen?

1. First unlock the phone, find the setting options, and click Open, as shown in the figure below.

2. Then, in the open settings page, find the lock screen and password, and click Open, as shown in the figure below.

3. You will see the lock screen signature option and click Open, as shown in the figure below.

4. Write down your favorite signature, and then click Save. Study hard and make progress every day.

5. Exit after setting, lock the screen, and you will see that the personalized signature just set has been displayed at that time.