Text time you’re typing something on the iPhone keyboard, click on the little microphone to the left of the spacebar. This starts voice dictation. Using this has become much faster than typing for me, and I type fast.
If you have trouble with it, set up a regular daily routine of messing with it for 1 minute. You won’t regret it. I’ve found that the hardest part, for me, is to get my thoughts clear about what I want to say before I begin talking. I think that’s a great habit anyway.