What is Amazon Whispernet?
Amazon Whispernet is a 3G WiFi package bundled with Amazon Kindle. It is delivered to Kindle users for free by Amazon and is delivered through AT&T.
With Amazon Whispernet enabled on the Kindle device, Kindle users can connect to the Amazon website to purchase books, download content, etc. However, Kindle users must be in the coverage area of AT&T are located.
In addition to Whispernet, Amazon also offers Whispersync and Whispercast. The former is a bookmarking solution that allows books and other content to be automatically synced between different devices. Whispercast is similar to Whispersync, but is intended for corporate customers.