Which jailbreak is better for the iPhone 4?
they are all the same
Which company should I buy an iPhone 4S for me to jailbreak?
Yes, it does. Both iPhones use the micro SIM card.
Should I buy an iphone 4 now or wait for the iphone 5 PS I have the 1st gen iPhone so i wanna new phone but w8ing seems better because they keep releassing new models every year which is annoying?
Depends, if you really want the iPhone 5 then you should get it if you don't mind spending more money on it. I'd wait.
How to Jailbreak an iPhone/iPod with GreenPoison Jailbreak?
Note: GreenPoison Jailbreak will work on IOS 4.1 firmware only.
Which iPhone 4 bumper color looks better on the white iPhone 4S?
a light green looks good.