We earlier covered the process to Jailbreak iPhone OS 3.0 with Redsn0w . iPhone 3G S also uses iPhone OS 3.0 , so it is possible to jailbreak and then unlock iPhone 3 G S with Ultrasn0w . But iPhone Dev-Team delayed the release of iPhone 3G S due to the development of iPhone OS 3.1 . So till then here is a Windows based software Purplera1n that reportedly help to Jailbreak with iPhone 3GS iPhone OS 3.0 .Purplera1n was initially released with support for Windows XP and Windows Vista . Recently released Purplera1n RC2 made it available in Windows 7 after fixing bugs and errors in first release . The best thing is that jailbreaked iPhone 3G S using Purplera1n can be unlocked with Ultrasn0w . Here we have the method to Jailbreak iPhone 3GS with Purplera1n for Windows .

Steps to jailbreak iPhone 3G S with  Purplera1n .

Connect iPhone 3G S to computer and run Purplera1n .
Make sure that you already have iTunes 82 installed .
Now from Purplera1n options ,select make it ra1n .
Restart iPhone and select Purplera1n installer Freeze and continue to jailbreak process .

Download  Purplera1n for Windows .

Purplera1n software to jailbreak iPhone 3G S is still in testing . So if you are successful in jailbreaking , you may consider to unlock iPhone 3 G using Ultrasn0w .