you use the keyboard on the kindle keyboard for
It depends on the type Kindle case to fit a Kindle Fire.
Router will use connecting to modem
You will need to buy a new modem that is designed for your DSL modem. This is due to the fact that the modem is designed to use the dsl signal opposed to the cable modem.
A phone number dedicated to modem use.
Because you use different modes to access it!
Yes, you can use your Kindle on a plane in airplane mode, which disables wireless connections.
if your modem has wireless caplebility, then a rounter is not needed
The modem is what detects communication signals then goes to the device.
You can use a wireless modem if there is an unlocked signal available.
Any modem can be used... if you want to play multiplayer, you should use a modem which can connect to the Internet.
If it's an android Samsung then YES...I use mine on my kindle, fire tho