Hi,
I am currently using WordPress 3.4.1. and Gravity Forms Version 1.6.4.5.4. and the Twilio Add-on Version 1.0.
I think that I have found a bug, where when you go to add a new Twilio feed, the plug-in form does not pull up and show all the Twilio numbers registered to the account...So what happened for me is that I have two Twilio numbers but only one is showing in the "From Number" field.
Please look into this.
Loc