Hi, you only need 3G if you want to be able to use the internet on it [to buy books....it's useless as a web browser unless you are in dire need], you do need to have WiFi to get the books on to it though, either at home or have access to it.
You can enlarge the text to various sizes too. It really is very simple to use and I love mine....have read about 30 books in the last 8 months on mine.
The keyboard is small but again you don't really need to use it, I order all my book on line at Amazon and they pop up on your
kindle within minutes!
Lisa x