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Whispernet of course is Sprint. If you aren't reasonably close to a Sprint tower, you won't get a signal. Interesting though that at least one K3 does fare as well as at least one K2.
I have a Kindle 2. I don't think it even does wi-fi. I think Sprint is all it knows.
Does the K3 simulcast on Sprint and wi-fi? Is there possibly a requirement that you select one or the other?
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