Chances are good that you use your iPhone's autofill feature so often that you take it for granted, barely noticing as your phone quickly loads in your passwords or credit card information.
But if you ever lose or cancel a credit card, or if you don't want personal data stored on your phone, or if you share your iPhone with others, then you may want to remove or at least customize the autofill feature. That way, you don't risk sharing too much sensitive information.
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How to edit credit card data autofill on iPhone
1. Open the Settings app and scroll down to the Safari tab.
2. Tap Safari, then tap Autofill under the General subsection.
3. Toggle "Credit Cards" to the left (button will turn white) to prevent the phone from automatically using any of the cards on file, or tap "Saved Credit Cards" (and then enter your password) to manage your various cards on a case-by-case basis.
How to edit saved password autofill on iPhone
1. In the Settings app, swipe down and click on Passwords & Accounts.
2. On the next page, you can disable auto-filling passwords by switching "AutoFill Passwords" off, or you can edit password data on a site-by-site or app-by-app basis by tapping "Website & App Passwords."
3. In the Website & App Passwords menu, on an individual basis, you can also change the username and password you use to access each site on your that you have saved.