As soon as my mobile phone was turned on, the SMS icon in the desktop dial bar disappeared. How should I reply?

Open the Android phone settings-application to see if the "information" program is still there. If so, you should have accidentally deleted the desktop icon and put it back on the desktop. If you can't find it, please ask a friend to send you a text message, and a notification icon will pop up after receiving it. If not, you can go to the application market to download one, and you can find the same brand of mobile phone.