@San: I have replaced wifi motherboards a couple of times with 3G boards, and they work fine. Mine were used, and came with the antennae.
Interestingly, there are different SIM cards in my 3 Kindle Keyboard 3Gs. I can manually set them to work on Telus network here in Quebec, but only one Kindle finds a signal when I am in the country. I've never been able to get the others to work on the 3G network when I am at my country place. All work fine in Montreal. I always bring the one that works in the country when I travel, and it works fine in Europe and North America.
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