sure as long as youre within range of a public network or hotspot, you can get internet for free
you can't.
No. You can't activate the iPhone without activating service plan. If you are just looking for the ipod and internet functionality, you should consider the iPod touch
Just jailbreaking your iPhone won't mess up or void your contract. It will void your iPhone's warranty from Apple.Installing apps which allow you to tether your iPhone without paying the extra monthly tethering fees is violating the terms of your contract. There may be penalties, including contract termination and fees, if you are caught.
Can you download internet on a DS i without paying every month?
yes it is a iPHONE so yes it can make calls
You will have to jailbreak your iPad/iPod/iPhone.
It can be done, but there are a lot of steps required into unlocking the IPhone 4 without paying. Then there is something about a jailbreak program. So yes you can do it but it doesn't seem easy.
WiFi.
Downloading music, shows, and commercials from the Internet without paying for them is illegal. It's best not to for both ethical and legal reasons.
Internet/ books
Yes, there are ton's of free apps you can search on the internet for. You can search for free navigation software. You can also read reviews, to see how the navigation software is rated.
Jailbreaking an ipod is a violation of the contract you have with your provider. While not illegal, it is still a violation of that contract, and could subject you to civil prosecution under that contract. It can also damage your ipod, and invalidate its warranty. Implicit, also, is the sense that jailbreaking would allow you to potentially download things that you are not allowed to download, such as copyrighted materials, without paying for them, which is illegal, and could subject you to criminal prosecution. As such, WikiAnswers does not provide information about jailbreaking an ipod.