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FreedomPop?

Word of warning: if you are about to sign up with a company called "FreedomPop" for "500Mb/month free 4G Internet", read the Terms of Service VERY carefully. Don't just click "I agree" on the page where you give them your credit card info.

You should know in advance that they will charge your credit card $10 as soon as you get to 400Mb in a month. They also added an $8.33/month "premier" package to my "free" service. Caveat emptor. TANSTAAFL.