It doesn't exist anymore as of June 27th 2015 according to many posts that I have read like this one from smallbizgeek
So don't waste your time and get with your smartphone notifications app.
I was looking for this because I wanted to keep my free google voice and text now voip numbers alive. I didn't want to have to keep sending a text to my self every 30 days or so. Oh well so much for living in a connected world.
I followed the tutorial on how to sync my google calendar to my iphone here