But if you use google voice number for a business purpose you can add your number to Google 411. But this is only for Business use. Whether in future Google will introduce Google voice toll-free number or not is unknown so far.
GOOGLE VOICE SETUP
Google voice is truly a great app. Any individual with a smartphone can download, install, set up and sign up and use Google voice to make calls, text messages and voice to others. You can link your Google voice number to any mobile or landline number out there.