Personally I have always found the keyboard on mobile phones too small and have always preferred email to text messaging.
However now it is possible to control your phone or tablet by simply speaking to it.
So if you want to send a SMS message to someone you just say
Send Text to Steve- Texting is easy
If it isn’t installed on your phone or tablet just download the Voice Search app from Google store.
It should work on Android 2.2 and above.
Here is a Google video showing how it works:
Note: Although the App is called voice search it is not restricted to search.
References and resources: