Yes and it works pretty well for me
By jailbreaking it.
Jailbreaking will void your iPhone's warranty.
You cant without jailbreaking it.
Jailbreaking is free.
Jailbreaking a phone is partially legal and partially illegal. I have a post regarding this http://www.techlucid.com/2013/11/is-jailbreaking-illegal-or-not/
yes it is absolutely legal
It is okay to jailbreak your iPhone 3g. The only downside to jailbreaking your iPhone is that you will loose your Apple warranty.
yes jailbreaking your Iphone/Itouch will not ever break the devices. the only difference with jailbroken iphone is that you have access to "Cydia" which is an app store made for apps that are not allowed on the Apple App store. I highley suggest using GreenP0isen.
Yes by jailbreaking your apple device
No. Sorry.
It is not illegal but will invalidate any warranty.
No, that is not true. Jail broken iPhones still have access to the Apple app store. The only thing it will do is break your Apple warranty on your iPhone.