A little while ago when I was on the VZW site to pay our bill I noticed this.
“Push To Talk
Select any of the following features:
Unlimited Push to Talk
Push to Talk on your BlackBerry and use it like a walkie talkie. Get instant 2-way connection with one person or a whole crew of up to 50 people.”
This option was in the “change features” section for my commando.
The odd part was for the other 3 PTT capable phones we have on our account the PTT option was not available.