A custom URL is a url scheme provided by the ios system that can perform internal operations of the app. Entering the url scheme in the built-in browser will execute the corresponding app operation.
1.iCloud - prefs:root=CASTLE
2. Wireless LAN - prefs:root=WIFI
3. Bluetooth - prefs:root=Bluetooth
4. Cellular network - prefs:root=MOBILE_DATA_SETTINGS_ID
5. VPN - prefs:root=VPN
6. Notifications - prefs:root=NOTIFICATIONS_ID
7. Phone Ringtone - prefs:root=Sounds&path=Ringtone
8. General - prefs:root=General
9. About this machine - prefs:root=General&path=About
10. iPhone storage space - Prefs:root=General&path=STORAGE_ICLOUD_USAGE/DEVICE_STORAGE
11. Date and time - prefs:root=General&path=DATE_AND_TIME
12. Keyboard - prefs:root=General&path=Keyboard
13. Keyboard keyboard - prefs:root=General&path=Keyboard/KEYBOARDS
14. Language and region - prefs:root=General&path=INTERNATIONAL
15. Description file (VPN and device management) - prefs:root=General&path=ManagedConfigurationList
16. Restore - prefs:root=General&path=Reset
17. Control Center - prefs:root=ControlCenter&path=CUSTOMIZE_CONTROLS
18. Auto lock time setting - prefs:root=General&path=AUTOLOCK
19. Accessibility - Prefs:root=General&path=ACCESSIBILITY
20. Wallpaper - prefs:root=Wallpaper
21. Siri and Search - prefs:root=SIRI
22. Face ID and password - prefs:root=TOUCHID_PASSCODE
23. Battery - prefs:root=BATTERY_USAGE
24. Privacy - Prefs:root=Privacy Location Services -prefs:root=Privacy&path=LOCATION
25. Wallet and Apple Pay - prefs:root=PASSBOOK
26. Mail settings - prefs:root=ACCOUNT_SETTINGS
27. Notes - prefs:root=NOTES
28. Phone - prefs:root=Phone
29. Facetime call - prefs:root=FACetimE
30. Music - prefs:root=MUSIC
31. Photos - prefs:root=Photos
32. App Store - prefs:root=STORE
33.Safari - prefs:root=SAFARI
34. Shortcuts - prefs:root=SHORTCUTS
35. Open Music - music:
36. Open video - videos:
37. Open Notes - mobilenotes://
38. Open the map - map://
39. Open wallet - shoebox://url-scheme
40. Texting - sms:
41. Send mail - mailto:
42. Call someone - tel://1123
43. Send a text message to someone - sms://mobile number
44. System update - prefs:root=General&path=SOFTWARE_UPDATE_LINK
45. Personal Hotspot - prefs:root=INTERNET_TETHERING
46. Location Services Permission Settings - prefs:root=LOCATION_SERVICES
47. Personal Hotspot - prefs:root=INTERNET_TETHERING
47. switch network - prefs:root=MOBILE_DATA_SETTINGS_ID&path=MOBILE_DATA_SETTINGS