On November 24, the service will be available only to those in the Top 100 markets. For a list of those markets,
click here. It's a PDF, so it may take a while to load. Everybody else gets portability sometime next spring.
I only know this because my mom and I went in to inquire about it and we had three different cell phone companies tell us that Milwaukee wasn't a Top 100 market. None of them will be getting our business, particularily the scum at AT&T who tried to sell me a "national" plan that didn't work in half of Wisconsin.