What are my options?

[MattyOnaMac]

Hi Guys,

I've got an iPhone 4 on iOS 4.2.1. I want to jailbreak, I've never jailbroken this phone before, and I just wanted to know what my options are?

I do not need an unlock btw!

Thanks!

I think Im going to use greenpois0n. Is it a good idea to use it atm? I've seen some users with problems?

Also, do I really need to do a full restore beforehand?

[iYeow]

Yes, it is safe to use GreenPoison RC5B4 to jailbreak at 4.2.1 for your iphone 4.