What does it mean to send a short message with a small lock in it?

Samsung's SMS has a small lock, which means that the locked SMS will not be deleted, protecting users from deleting important information by mistake. SMS Lock is a lightweight software to protect your personal information.

Locking method:

First, enter the information main interface, select the information to be locked, click the information to enter the information dialogue interface, and then click the information dialog box to enter the information reading interface.

Click the menu key-select "Lock" to lock the current information.

After setting the information lock, when you need to delete this message, you will be prompted "This session will be deleted". You need to check "Include Protection Information" to delete the message.