Hi,
Yes i jail broke my new iPhone 4 this morning now i am running cydia iOS 4.3.5 the jailbreak was very easy it only took me about 5 mins
Jailbreak iPhone Visit, WWW.iphone5break.COM
The 4.3.5 untether works on all devices that actually support 4.3.5
* iPad1: 4.3 through 4.3.4 4.3.5
* iPad2: 4.3.3 4.3.4 4.3.5
* iPhoneGS: 4.3 through 4.3.4 4.3.5
* iPhone4: 4.3 through 4.3.4 4.3.5
* iPhone4-CDMA: 4.2.6 through 4.2.8 4.3.4 4.3.5
* iPod touch 3g: 4.3, 4.3.2, 4.3.4 4.3.5
* iPod touch 4g: 4.3 through 4.3.4 4.3.5