You can use the space bar on your iPhone for cursor control by doing this:

1. Touch and hold the space bar
2. The cursor will appear as a blinking line
3. Drag your finger to move the cursor
4. To delete text, tap the backspace key
5. To insert text, tap the space bar again

You can also use the space bar to select text. To do this, simply touch and hold the space bar, then drag your finger to select the text you want. When the text is selected, you can delete it, move it, or copy it.

Here's some more things to do with the space bar and cursor control:

• You can use two fingers to move the cursor more quickly
• To move the cursor to the beginning or end of a line, double-tap the space bar
• To move the cursor to the beginning or end of a text field, triple-tap the space bar

I hope this helps!