How to set up a mobile phone to send text messages to another mobile phone as long as it is unlocked?

You can set your mobile phone to automatically send SMS to another mobile phone after unlocking by the following steps:

1. Open the phone settings: find the "Settings" application on the home screen and click Enter.

2. Find the "Security and Privacy" option: In the settings page, slide down, find the "Security and Privacy" option, and then click Enter.

3. Find the "Screen Lock" option: On the "Security and Privacy" page, look for "Screen Lock" or similar options, and then click Enter.

4. Set the screen lock mode: on the screen lock page, select the screen lock mode suitable for you, such as password, pattern or fingerprint. Follow the instructions on the screen to complete the setup.

5. Open the "emergency contact" function: return to the "Security and Privacy" page, search for "emergency contact" or similar options, and open the function.

6. Add an emergency contact: On the "Emergency Contact" page, click "Add Contact" or similar options, and select another contact for receiving SMS.

7. Specify the conditions for sending SMS: Some mobile phone settings allow you to specify the conditions that trigger sending SMS. For example, you can only send text messages after entering the wrong unlock password several times. Choose the appropriate conditions according to your needs.

Please note that the above steps may be different for different brands and models of mobile phones. Therefore, the specific steps and menu options may change. You can find similar options in the setup application according to your phone model and system version.

In addition, there are some third-party applications that can provide more advanced functions to meet the needs of sending short messages when unlocking. You can search in the app store and try some secure screen locking applications to meet your own needs.

If your mobile phone doesn't have built-in related functions and can't find a suitable third-party application, you may need to program or use other devices to realize the function of automatically sending short messages. In this case, deeper technical knowledge and solutions may be needed.