Apple's mobile phone has a screen lock password, and the text message is gone.

No way, let iPhone 4 enter DFU mode, then connect iTunes, restore the firmware, then prevent iTunes from automatically backing up, and then restore the data originally backed up in iTunes. How to enter the DFU: How to enter the DFU1:Connect the iPad to the computer, and then press the On key and the HOME key (round key) at the same time. After about 5 seconds, when you hear the first sound from the computer, please release the switch and still press the home button. After about 5 seconds, when you hear the second sound from the computer, release the HOME button, and the iPad will enter DFU mode with a black screen. Then, open iTunes and follow the prompts to continue. The way to enter DFU is 2: 1. Connect your iphone to your computer. 2. Right-click My Computer > Properties-> Hardware-> Device Manager->; Universal serial bus controller, you will see that there is an "Apple Mobile Device USB Driver" 3 in it, and then press POWER+HOME at the same time regardless of the state of your iphone (that is, whether it is turned on or off) (note: the power button is the on/off button at the upper right, and the home button is the round button at the bottom of the screen). When you see the "Apple MobileDevice USB Driver" in the "Universal Serial Bus Controller" disappear, release the power (note: you still press and hold HOME at this time). When you see "Apple Mobile Device USBDriver" appear again, let go of HOME, and then you will enter the DFU mode with a black screen.