Software-only solution to Unlock iPhones of all versions

I) Errors running iPhoneWonders

iPhoneWonders may display an error message and fail to run, or it may hang at the
"waiting for phone" steps. If this happens, you should try the following:

1) Make sure iTunes is shut down.
2) Make sure iTunesHelper and any other services or daemons releated to iTunes are not running.
3) Try putting your phone into recovery mode manually (see below).
4) Upgrade to iTunes 7.6 and sync your phone with iTunes before trying iPhoneWonders.
5) Reboot your computer.
6) If possible, try another computer.

To enter recovery mode manually:

1) Quit iTunes and close any "helper" daemons.
2) Hold the power button on your phone until the "slide to power off" message appears.
3) Slide to power off and wait for the screen to go completely black.
4) Unplug your phone from the cable or dock.
5) Hold the HOME button on the phone and reconnect it to the cable or dock.
6) Continue holding HOME while the Apple logo appears.
7) Continue holding HOME until the "Connect to iTunes" graphic appears.
8) Release HOME. You're now in "Recovery" mode (not to be confused with DFU mode).
9) Try running iPhoneWonders again.

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II) Problems After Jailbreak

After successfully completing a jailbreak, you may notice some of the
following issues:

* YouTube not available
* No cell access (phone and/or SMS don't work)

Most of these issues can be fixed by running one or both of the Reset Settings
options in the phone's settings application.

1) Tap on Settings from the home screen.
2) Choose General
3) Choose Reset (all the way on the bottom)
4) First try "Reset Network Settings"

The phone will reboot. If things still aren't working, go back and try
"Reset All Settings".

* Visual Voicemail doesn't work (official carriers only)

To fix Visual Voice mail, launch the Phone application and click Voicemail. It
will probably try to call into the voicemail phone number. If it doesn't tap
the button to make it call. Let the call complete and check your voicemail.
End the call, wait a minute or two, then try visual voicemail again. You should
be prompted to enter your voicemail password and Visual Voicemail will work after
that. Some have had luck by changing their password during the phone call or
rebooting afterwards. Of course, Visual Voicemail ONLY works with official
iPhone carriers, so if you're using an unlocked phone with another SIM, this
won't work no matter what you do.

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III) Starting Over

If none of the above helped, it may be necessary to restore your phone to a
completely clean state before trying again. To do this, perform a
"DFU Restore" as follows:

A) The Easy Way:
    1) Shutdown iTunes and connect the phone.
    2) Run iPhoneWonders.
    3) Your phone will show the "Connect to iTunes" screen.
    4) iTunes should be able to restore 1.1.4 firmware to your phone.

    Note that this isn't "full" hardware DFU mode, but it should be adequate
    to install a current firmware with iTunes.

    If you enter this mode by mistake, iPhoneWonders should reboot normally.

B) Full Hardware DFU (required for downgrades):
    Note that using a cable instead of the dock may make it easier to press
    buttons in the following steps without losing the connection.

    1) Start iTunes and plug the phone in.
    2) With the phone powered on, hold both the POWER and HOME buttons for
      seven seconds. The screen should turn black.
    3) Wait two seconds while the screen is black and release the POWER button
      while still holding the HOME button.
    4) The screen will remain black, but after a few more seconds iTunes will
      detect the phone in recovery mode.
    5) Release the HOME button and proceed to restore firmware with iTunes.

    Timing is fairly important on this. If your phone reboots or ends up in
    recovery mode, just try again. You might want to look at a clock that shows
    seconds while you do this. The timing needs to be exact for it to work.

    If you enter this mode by mistake, hold the HOME and POWER buttons for
    seven seconds until you see the Apple logo and immediately release both
    buttons. The phone should reboot normally, assuming a valid firmware image
    is present on the phone.