How can I jailbreak my iphone without messing it up?

Just try here.

@troubleinharlem thank you for making no effort in answering this.

@bored101 : I did make effort! I had to open a new tab, type that into google, and then type search.

@bored101 thank you.(not really). I’m assuming you dont jailbreaking iphones considering the fact that you dont know anything about the baseband or firmware and just think its that simple.

It really seems like a mess right now. If you have iOS 4.2.1, try to hold off for a couple of weeks until the Dev Team, GEOHOT and/or Comex gets their stuff together. Otherwise, you have to knock your iOS down to 4.0 or 4.1. Go here for help.

Hi ,
4.2.1 Is unlock able , im running iPhone 4 with 4.2.1 on 00.59 Modem (Unlock able)
You should try greenp0ioson , its pretty easy to jb
you can see jailbreakmatrix.com – for the full chart