FreedomPopFreedomPop has become an official carrier, offering a free mobile plan to buyers of their smartphone. It is the first service of its kind, and already it is making other mobile companies sweat.

Here is how it works:

You pay for the smartphone, which right now is a a refurbished HTC EVO 4G for $99. That phone will come with an automatic 200 minutes, 500 texts and 500 MB 4G/3G data plan. Alternatives include a $7.99 per month plan on 500 minutes, unlimited text and 500 MB data, or $10.99 per month unlimited voice and text with the 500 MB data.

You can also do a free trial for 1GB data plans that after the trial will become $0.01 per MB over the allocation, and $2.49 optional visual voicemail.

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