You'd end up connected to the Amazon Whispernet network and everything has to go through the Amazon web proxy servers. All other connections are blocked. If you're in a region which doesn't give you free web access via 3G on your Kindle then all you can access is the Kindle store and Wikipedia.
It'd be fairly obvious if somebody had taken the SIM out of their Kindle and put it into something else as they'd get odd requests which wouldn't ever be generated by a Kindle. The amount of data would be unusually large compared to a regular Kindle user as well.
If you're happy with breaking the Kindle TOS, having everything go through the proxy which you can't avoid and risk Amazon disabling your SIM and Kindle then sure, go for it. Don't blame us if anything happens though.
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