iphone jailbreak ..like something

hi guys,
i have iphone 3g version 3.1.3

Q1: what is jailbreak? what is its benefit?
Q2: which is latest version of iOS?
Q3: what i have to do to switch my iphone software to latest version?
Q4: how can i use many themes and apps rotation when moving to next page?
Q5: what is cydia and blackrain?

Google is your friend. There are numerous things you can do with a Jailbroken phone.

You seem to have a lot of questions. It may sound like bad advice but I say jail break it and if you don't like it, just restore. Go to JailbreakMe and if your phone can be rooted, just slide to jailbreak! It will make sence when you go to the site.

Good luck

Stretch said:

Google is your friend. There are numerous things you can do with a Jailbroken phone.

Click to expand...

You get free everything apps ringtones text tones. And you can customize everything keyboards bars icons etc.