What abookreader said. Amazon will see a WiFi only Kindle on Whispernet and the servers probably won't like that. I've not heard of anybody trying this before so you're breaking new ground on this one.
Does your K3 WiFi have the 3G modem socket + SIM holder? I've seen several sets of internal photos of the WiFi only models and not all of them have those components fitted. The only K3 WiFi I looked at didn't have either socket and there may have been some passive components missing around that area as well. I didn't have a K3 3G+WiFi model nearby to compare for those small components.
If you do manage to fit the 3G card into a K3 WiFi, please post back with your results. Thanks.
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