[draghn]

When you log into Google Voice on the web, look at your settings. In the phones section, click "Edit" on your mobile phone that's integrated with Sprint. In the area that pops up, there is a checkbox :
"Text Settings:
Receive text messages on this phone (mobile phones only) "

Check that and save your changes. I have the google/sprint integration (used my pre-existing GV number to be represented to others) and I get the texts as I did before the integration. They also show up in Google Voice too, so it's like having a backup of your texts online as well. Both incoming and outgoing.

That should do it for ya. If you don't want texts to go to your default messaging app, uncheck that box and just use the google voice app. Good luck!