Ever wanted to move that pesky cursor on an iPhone (without Touch 3D), for example in your browsers address bar? Apparently you can press and hold the space bar on the on screen keyboard. Or, as Apple puts it:
Turn your keyboard into a trackpad
- Touch and hold the Space bar with one finger until the keyboard turns light gray.
- Move the insertion point by dragging around the keyboard.
From: https://support.apple.com/guide/iphone/type-and-edit-text-iph3c50f96e/ios (bottom of page)