There's a messaging icon on the main screen that, once tapped, takes you to SMS creation. The screen is a little cramped in tall mode, but you can switch between a T9 keyboard and handwriting recognition, depending on your desired form of input.
You can also tap the on-screen keyboard icon in tall mode to switch to a widescreen mode with a full QWERTY keyboard.
Handwriting recognition is quite slow, but then so is using either of the on-screen keyboards. The screen is a resistive type and it needs quite a serious press to register anything. There will be no feathery-fingered tapping at the speed of light on the LG Viewty Snap GM360.
Aside from SMS, mobile email is supported too. You'll find the wizard for setting it up is pretty straightforward to work with.