On iPhone 4s or later, you can dictate instead of typing. Make sure Siri is turned on (in Settings > General > Siri) and iPhone is connected to the Internet.
Dictate text. Tapin
the onscreen keyboard, then speak. Tap Done when you
finish.
Add text. Tapagain
and continuing dictating. To insert text, tap to place the
insertion point first. You can also
replace selected text by dictating.
You can also start dictation by bringing iPhone to your ear, then moving iPhone back down in front of you when you're done. To turn on this feature, go to Settings > General > Siri.
Add punctuation or format text. Say the punctuation or format. For example, "Dear Mary comma the check is in the mail exclamation mark" becomes "Dear Mary, the check is in the mail!" Punctuation and formatting commands include: