I recently discovered this by accident and when I mentioned it passing last night it’s clearly one of many things about the S60 that takes some exploring to learn.
When entering text in T9 mode, you can get the dictionary to choose a different word while it’s underlined with a simple tap of the * key. Here’s a quick example:
T9 was smart enough to know I wanted Test first, but in case you were actually typing something else, you can cycle through the choices with the * key.
