Apple's mobile phone lock screen does not have a separate Apple logo. By changing the wallpaper, the Apple logo can be displayed when the screen is locked. You can also download third-party software to set the lock screen theme and choose the Apple theme.
If you want more system functions, you need to jailbreak the phone to complete it. Jailbreak refers to a soft cracking operation on iOS by gaining full control and access to Apple's operating system iOS.