YES, "jailbreaking" or ANY type of modifying the device does VOID ALL warranties from apple. [But in my opinion: I don't give a flying f*** for warranties]
Yes, jailbreaking does void the warranty.
Jailbreaking will void your iPhone's warranty.
"Jailbreaking" is another word hacking. Therefore you void your warranty but you get cydia, a jailbreaking software. Jailbreaking does have it advantages and Disadvantages. But if you want to send it to apple to repair it you have to restore it to factory settings to get back your warranty.
No. But it will void your warranty
Sadly, yes.
No. it justs voids apple's warranty.
Yes, of course.
No, jailbreaking has been legal since 2010. However, if you jailbreak, you will void your warranty.
It is not illegal but will invalidate any warranty.
Yes. Jailbreaking will not affect any of the default functionality of the iOS software.
It is. The only problem is that it voids your warranty which means, if it breaks due to the jailbreaking, you won't get it fixed, or get a new one for free.
If you cannot restore it using iTunes restore function, you will have to bring it to an Apple store for service. If you bricked it by jailbreaking it, you will have to pay for the repair, even if it is under warranty.