Since we're speculating here... IF a sidekick were to ever reach VZW, I would be more than confident to say that it would only need the $15 a month VCast for unlimited data just like the Voyager.
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I was secretly hoping that by "red" you meant Verizon. That said, it'd probably be saddled with the PDA/Smartphone $45/month data plan anyways.
Since we're speculating here... IF a sidekick were to ever reach VZW, I would be more than confident to say that it would only need the $15 a month VCast for unlimited data just like the Voyager.