Me too. I certainly will. I don't use Google Voice that often, just to text phones when I don't know the email address. Every text received/sent via Gmail also leaves a copy with Google Voice, whether originally sent from Gmail or from Google Voice. While I immediately delete messages in Gmail after being read, I didn't realize they were not automatically deleted in Voice and spent quite a while deleting them one at a time from the phone.
The only way I've found to "mass" delete messages from Voice involves also having it on my laptop where there's a "mass" delete check box. However, "mass" is in quotes because there's a caveat. When you check the master box at the top left, you can only mass delete those that appear on the current screen. If I don't keep up with it, it can take a surprising number of screens to delete, one at a time.
Thanks for solving my problem with deleting them from the phone. I wanted to be able to do it from the phone without having to involve the laptop.