Can any 1 tell me the safest n easy way to jail break my iphone 4

[dosti]

Please help me in jail breaking iphone 4.
Running ios 5 the previous 1
Can i upgrade my phone to ios 5.1 after jail breaking???

 

[emad.iphone1981]

Please help me in jail breaking iphone 4.
Running ios 5 the previous 1
Can i upgrade my phone to ios 5.1 after jail breaking???

Yes
You can
But with out jailbreak

 

[Thomasjtsi]

Please help me in jail breaking iphone 4.
Running ios 5 the previous 1
Can i upgrade my phone to ios 5.1 after jail breaking???

You can Jailbreak using redsn0w. However... updating to iOS 5.1 will un-Jailbreak your iDevice. Currently the only Jailbreak for iOS 5.1 (pre-A5 iDevices only) is also by using redsn0w... but it's a TETHERED JB.