Directly remove an installed app that you can’t find on your iPhone.
Go to Settings > General > Storage & iCloud Usage > Manage Storage to get a list of all the apps on your device organised by memory size.
Find the hidden apps on the list that you no longer require and delete them. You now have the option to offload an app from your iPhone.
Remove an app from the App Library.
Swipe left from your Home Screen until you reach the App Library.
To access the list, tap the search area.
Hold the app icon in your hand, then hit Delete App.
To confirm, tap Delete once more.
How to delete voicemail on iPhone
To get started, tap the Phone app.
In the lower-right corner of the screen, tap Voicemail.
Locate the voicemail you want to delete and press the Delete button. To see the choices underneath it, tap it once. You may also expose the Delete option by swiping right to left.
To delete the voicemail, tap Delete (or the trash can icon on some iOS versions).
How to delete cache on iPhone
Scroll down to the fifth group of choices under Settings (starting with Passwords & Accounts). Select Safari from the menu.
Tap ‘Clear History and Website Data’ at the bottom of the page.
To confirm, press ‘Clear History and Data’ on the window.