Huge Google fan, been using Biz Apps for everything. I have over 10 paying monthly customers that I moved from Exchange to Google Business Apps, and love their services.
However a few weeks ago I logged into my business google voice account, and noticed my number had gone missing (with out any notice).
It was one hell of a pain in the ass trying to get that number back, put together the full details in this article:
Google Voice Lost My Number | How I Got It Back - Sultan Solutions | Milwaukee Web Design Development Managed IT
In essence I paid to port a number from Sprint to Google Voice. Out of the blue Google Voice deleted my number, and then made it publicly available for anyone to take about a week later.