This is an iPhone sleeve which can link a 3G iPhone to a "free 4G" network. Not only can be used as a wifi hotspot, butalso has a built-in battery to extend the iPhone's internal battery an additional 6 hours. When you get it ,you can enjoy "up to 1GB of free data every month." and it only cost you $99.According to GigaOM, each additional megabyte will cost a penny. Service coming soon to this summer. I hope the service can be all around the world. Freedom Pop iPhone Sleeve
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