What if the SMS icon on Sony Ericsson X8 is missing? Just press it and it's gone ...

It disappeared from the home screen. Is it still in the menu? Click the Info icon in the menu, and then add it to the home screen. If there is no release and no response, it means that you have locked the home screen! ! Your mobile phone will crash soon! ! ! !

Hehe, just kidding. Press the button on the left side of the phone on the home screen, and a menu will appear with "Lock Home Screen" (or in "More"). Just choose it.