PV: GSM: How do I activate my SIM card? It gave me an error saying “unsupported zip code.”

You can activate the SIM card on the ACTIVATE page with your chosen rate plan at http://freedompop.com/activate and your number will show up after the activation and you will receive a welcome email advising you of your new mobile number. A US zip code, preferably of a major city, needs to be used, and the area code will depend on the zip code you'll use on activation.