I suggest you go on mobile me
No, you can even unlock the iPhone when Jailbroken.
You lose the warranty you get from apple, and it can permanently break your phone.
Yes, you will.
Yes
Not unless you want to lose your unlock
No, itunes supports it.
her undies, iphone, and boyfriend
Yes you can but you will not get the benefit of the 3G network speed, you will only get EDGE. Also this will require an iPhone data plan change and if you had the unlimited plan on the iPhone 3Gs you will lose it and you will not be able to get it back.
50 billion dollars
you cant you just have to figure it out
By acquiring the iPhone 4s you only gain, more space, better speakers, iOS 5+ , and to me the best is Siri
No you will not lose any info stored on the original iphone, as long as you create a back up in iTunes. When you use the new iPhone be sure to Restore From Backup.