Yes you can jailbreak the iPhone 3GS. There are several different ways of doing it and there is a matrix that you can match up your particular device's model, firmware, and boot loader information and it will tell you what program that is best recommended for your device. The link has been attached in the Related Links.
To unlock iPhone 3gs on iOS 4.1 you have jailbreak your device first.
yes
Jailbreak it?
Sure you can unlock your iPhone 3gs but before that you have to jailbreak iPhone 3gs.
use the newest version on green poision
Yes
If you have the iPod Touch 3G or 4G (current one), an iPhone 4 (not the iPhone 4S) or iPhone 3GS, or the original iPad (Not the iPad 2) then use redsn0w 0.9.10 to jailbreak. If you have an iPad 2 or, iPhone 4S, you cannot jailbreak it on iOS 5.0.1 yet
Here's a guide on how to jailbreak your iPhone iPod or iPad ios 4.2.1 and all previous models: http://reviews.ebay.com/How-to-Jailbreak-Your-iPhone-4G-iTouch-or-iPad-4-2-1_W0QQugidZ10000000020131595 I followed the step by step instructions and jailbroke my iPhone within minutes!
The easiest way is to go to the website Jail break me (located in the related links below) on your iPhone itself and it does the work for you.
iPhone/iPod Touch/iPad iPhone: 1G, 2G, 3G, 3GS, 4 iPod Touch: 1G, 2G, 3G iPad
Sorry, but if you have an iphone 3GS, then there is really no way to jailbreak it yet, atleast not a safe jailbreak that will work, but if you want to change the black theme on your apps page (behind all your applications) then go to settings, general, accesibilaty, and then you should see something that says white on black, change it to white and your iphone setup will be a lot cooler. Hope I helped a little.
Jailbreak iPhone - What Does It Mean? cellphones.about.com/od/glossary/f/jailbreak_faq.htmQuestion: What Does It Mean to Jailbreak an iPhone? ... you can do even more than that: Jailbreaking even lets you to unlock your phone so you can use it with ... iOS jailbreaking - Wikipedia, the free encyclopedia en.wikipedia.org/wiki/IOS_jailbreakingSuch devices include the iPhone, iPod touch, iPad, and 2nd Gen Apple TV. .... the first iPhone unlock, released a jailbreaking tool for the iPhone 3GS on iOS ....