Control F on iPhone is a keyboard shortcut that allows users to quickly search for specific text within a document, webpage, or other text-based content.
To use Control F on iPhone, simply tap the Share button in the bottom toolbar, then tap the Find in Page button. The Find in Page field will appear at the top of the screen. Enter the text you want to search for in the field, then tap the Find button. The iPhone will highlight all instances of the search text within the document.