Is it free to do Internet browsing on 3g kindle?

From: Kindle (Free 3G) License Agreement and Terms of Use

Amazon provides wireless connectivity free of charge to you for certain content shopping and downloading services on your Device. You may be charged a fee for wireless connectivity for your use of other wireless services on your Device, such as Web browsing and downloading of personal files, should you elect to use those services.

Yes, Kindle 3G has the free 3G feature and works globally but it comes with 2 version Kindle 3G+Wifi, and Kindle 3 Wifi only. So if you want to connect to Internet free of charge anywhere, anytime, you should buy the Kindle 3G+Wifi version, and it comes at the price $189. However, if you could easily find a free Wifi connection such as in the coffee shop or in your work office, you might consider the Kindle 3 Wifi only version as it come at a lower price $139.