Unlocked iPhone/ iPad and iPod Touch is not secure from make changes in home screen. If you know there is a no restriction on delete/ Remove installed app from home screen. Like install new app from App store. Install new app (Free or Pro) in app store always required Apple ID password or Touch ID (if setup) for the security reason. But not required on Remove/ Delete installed app on iPhone/ iPad/ iPod Touch by default. You can do that, Stop delete iPhone app.
Steps for Stop delete iPhone app, iPad, iPod Touch: From iOS 9 Home screen
Step 1: Go to the Setting app on iPhone/ iPad.
Step 2: Next, Tap on General.
Step 4: Next, Disable Deleting apps option.
Disabled mode: cross icon missing when you try to delete app on home screen. All icon jiggle only not showing ‘x’ on app icon.
See below video tutorial for more help on Stop delete iPhone app,
For the information, Restriction on install new app from app store to your iPhone/iPad/ iPod Touch also available. By Disable In-App Purchases and Installing apps option.
Other Restrictions option you will find here only, on missing default app on your iOS device, Just look inside the restriction, Wrong setup in restrictions area may be hide app from access on home screen or Spotlight search also.
Know more update and help on Stop delete iPhone app, share with us on comment or Touch with us new update and other restriction features for future iOS or Apple Devices.