Cache is all the data your phone stores locally, but over time it can build up and slow down (or even overheat) your phone. Here's how to clean things up.

Open the iPhone Settings app, scroll down, and select Safari. Select Clear History and Website Data. When prompted to confirm your choice, choose Clear History and Data to delete the log of websites ...

Here’s the quick, step-by-step process to delete all call history from your iPhone’s “Recents” list: Open the Phone app. Tap the green Phone icon from your Home Screen or App Library.

Apple doesn’t provide a built-in “Delete All” button in the Contacts app, so you have to approach it through different methods depending on your situation.