There are so many tools, some for Mac OS, others for Windows, different versions... Complicated. So let's summerize a little bit.
If you have iPhone 3G, you'll be able to install 3-rd party non AppStore applications (through separate applications called Cydia and Installer) and run these applications. If you have old iPhone, in addition to that you'll be able to unlock the device (use with any carrier).
There are two methods: quickpwn and custom firmware method. First one is for quikly pwning and jailbreaking the device without restore. You should use it if you have unlocked device or an AT&T contract.
If you are Windows user:
Go for WinPwn. The current version is 2.5.0.2 (also called 2.5 beta-2). Download here. It supports both iPhone and iPhone 3G, firmwares 2.0, 2.0.1, 2.0.2. You can use either quickpwn or custom firmware method.
There is a separate QuickPwn tool for Windows. The current version is RC3. Download here. Do you need it? Yes, if you want to quick pwn and you do not like WinPwn (or you had problems with it).
If you're using Mac OS:
Go for PwnageTool. The current version is 2.0.3.1. Download here. Works with 2.0, 2.0.1, 2.0.2 firmwares using custom-firmware method.
There is a version of QuickPwn tool for MAC OS. The current version is 1.0.0. Download here. It works only with firmware 2.0.2. Do you need it? Yes, if you want to quick pwn.
QuickPwn is not a replacement for PwnageTool, they are different tools and provide different features, QuickPwn is for quickly pwning a device, whereas PwnageTool is designed to custom build and tailor the ipsw production process, both tools will be actively developed in the future.
Recently a new project has been started, called XiPhone. It will be based on XPWN. So functionality similar to WinPwn and Pwnage will be present (jailbreak, unlock, etc). In addition to that developers plan to include:
Auto downloading of stock firmware files from apple’s site (no need to hunt for it then select it)
Wizard based modern GUI (created with .net 2.0), and Vista Style UI.
Export of firmware settings so users can pass around an XML file which contains a configuration that works for them.
Auto updates to the XiPhone software.
Community based wallpapers used for Bootscreen, Restore screen and others
Enabling / Disabling of options available based on the device you select.
Unfortunately, only Windows platform users will be able to use XiPhone.
QuickPwn for Windows is updated. Support for all 2.x firmwares is added. So now you can QuickPwn and jailbreak the device if it is running 2.0, 2.0.1 or 2.0.2.
DevTeam reminds that it is still beta software, so usual rules apply, no complaints if anything goes wrong and use the tool at at your own risk!
Using QuickPwn does not update the firmware itself, this tool is designed to ‘Pwn’ (the ability to install future custom non-Apple firmwares) , ‘Jailbreak’ and install Installer and/or Cydia on a given device. If your device is running 2.0.1 and you QuickPwn it, it’ll still be running 2.0.1, although it will now be Pwned and Jailbroken. It will also activate (not unlock) devices that are being used outside of their intended territories and cannot be activated using iTunes.
If you want to update to 2.0.2 then use the normal iTunes update to get to 2.0.2 and then use QuickPwn to Pwn, Jailbreak and Activate, remember that the 2.0.2 update includes a baseband update for the 3G iPhone, so depending what your long term intentions are for the phone, update wisely, of course in the upcoming PwnageTool application you’ll be able to create a custom ipsw without the baseband update enabled.
DevTeam created a quick solution for jailbreaking an iPhone. It is called QuickPwn. It is in beta, so be careful. It will allow you to pwn (jailbreak) your device very quickly without restoring!
Who should use this tool? This is for those that are not planning to restore. It’s not clear what the activation state is after the process therefore, I only recommend this for those that have a contract carrier or an unlocked phone already.
If you are on a stock device and using AT&T or a contract carrier, this is the perfect jailbreak for you. You will not lose your contacts or have to do any backups. Finally, if you are going to restore anyway, especially if you need to unlock a 2g, you may as well use winpwn or such.
Currently QuickPwn requires your device to be running version 2.0.1 of the iPhone/iPod firmware. And it runs only on Windows. This requirement will change in a subsequent release.
"Next generation of ZiPhone is in the works.
It will be as simple as Apple would have done it.
A simple one click program.
A 5 seconds run.
Stay tuned."
PwnageTool 2.0.2 released just a day ago. And now WinPwn - iPhone jailbreaker and unlocker for windows is avaliable. The main new feature - it supports firmware 2.0.1.
PwnageTool 2.0.2 is out. It will support new firmware 2.0.1. It will jailbreak and unlock the old iPhone and jailbreak new iPhone 3G. Here are the download links:
Installer 4 Beta is included, it is added in any mode by default. The main installer package management interface within PwnageTool isn’t enabled yet, and will report that installer.app isn’t available, but the actual Installer.app package is added as a default option in both modes.
The latest Cydia is also enabled by default. We recommend to use Cydia, not Installer.
Bad news is that it is still not avaliable. DevTeam postponed their release. The good news is that version 2.0.2 will jailbreak 2.0.1 fimware (and unlock 2.0.1 for old iPhone) and have both Cydia and Installer 4 included. Stay tuned, the release will be in couple days.
There are several reports that updating to 2.0.1 on an iPhone in Airplane mode may result in bricked phones.
Users who paid Vodaphone to unlock their phones for international roaming have reported the update breaks connections with their carriers.
A few users report occasional lag in the Contacts, SMS and e-mail apps. From our testing, typing in the Contacts app is still laggy, but SMS and e-mail is faster.
No surprise whatsoever: Updating results in losing access to your jailbroken (i.e. hacked) apps. 2.0.1 updates iPhone 3G's baseband, you may never be able to unlock the handset again if you run this update.
Many users are reporting 2.0.1 is slow with backup. This more likely has to do with the version of iTunes they're running; many have said iTunes 7.7.1 sped up backup and syncing.
It is similar to the previous one. Same idea. The slim chip-and-circuit gizmo hugs the rear of your SIM and messes with the signals that go between it and the iPhone (or, indeed, a large number of other GSM and 3G phones) in a way that unlocks the device. Brando's product still requires you to cut your SIM to make room for the chip aboard it, but it looks a fairly simple operation. Costs just $21.
The main purpose is bug fixing. Many applications work faster. Here is the list of changes:
Drag an app icon across multiple pages in one motion, rather than having to drag it, drop it, pick it up again and drag it over to next page, and repeat.
Contacts are now more responsive.
Backup is much faster.
Apple may have changed the calibration of the iPhone's reception "bars" while connected to a 3G network to reflect a stronger signal than before.
Keypad loads quicker.
Screen rotation in Safari appears to be smoother.
Some apps may ask to be updated after the firmware upgrade.
SMS typing faster.
Google Apps works faster.
Netshare still works (for those who use it).
Works with iPod.
Multimedia content is kept after update.
No Support from Pwnage and WinPwn. If you update you'll loose unlock and jailbreak.