Yes, the Kindle (I have the K2 International) does have 3G connectivity.
no ipod touches have 3g connectivity only iphones have that
Yes it does have 3G connectivity but not video calling
That depends on what you are planning to use the iPad for. An iPad Wi-Fi with 3g has both Wi-Fi and 3g connectivity, whereas the iPad with Wi-Fi only has Wi-Fi connectivity. 3g connectivity allows you to connect to the Internet through wireless carrier's 3g network, while Wi-Fi allows you to connect to the Internet through nearby Wi-Fi networks.
Wi-fi no matter where you go
Yup. It has wifi and some models have 3G or 4G connectivity.
Currently, there is no cellular connectivity for the Toshiba Thrive, although there is a rumor that it will come out.
No it is not a phone and uses the Mobile network connectivity (3G) for internet connection
Keep in mind that the Samsung Galaxy S4 can operate in both 3G and 4G HSPA+ and LTE (US, Europe, and parts of Asia variants). 3G is better if you are looking to preserve battery life and just need basic data connectivity. 4G is better if you want faster data connectivity at the expense of battery life.
Yes. All iPhones are capable of standard 3G connectivity (on most bands) except for the original iPhone (launched 2007, no longer commercially sold).
Yes and some models have 3G connectivity all models have WiFi
3g connectivity in a laptop will allow you to get online from anywhere where there is cellular service. While you are limited in bandwidth, like you are on your phone, it is great for people who need to check email and such while on the run.