“And for those wondering, yes the 3.0 OS is jailbreakable on all devices.”
~ Dev-Team

The Dev-Team has already jailbroken the latest iteration of iPhone firmware before it’s official release. Only iPhone 3G users will need to wait for a custom firmware package to update their iPhones without updating their baseband and losing unlock capabilities.
The iPhone 3G Unlock has Arrived
Sitting in a freezing New York sublet still recovering from an even colder New Year’s Eve filled with long cab rides, empty promises and unattainable resolutions, I find myself reminiscing about the ball drop and people’s lips counting down to yellowsn0w, the first impactful statement of the New Year.
Your iPhone 3G is no longer locked to AT&T or it’s respective international counterparts, so ring in the new year with your carrier of choice. Details below.
As Always Thanks DevTeam!
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Exerpt from the DevTeam:
Don’t eat yellowsn0w!
Hello all,
We wish you a very happy, healthy, and hopeful 2009!
We have released the 0.9.1 beta yellowsn0w 3G unlock application.
RELEASE INFO
Cydia source: http://apt9.yellowsn0w.com/
Installer repo: http://i.yellowsn0w.com/
“Diving into yellowsn0w”
The DevTeam unlocks the iPhone 3G to work on any carrier.
Meanwhile, on an apple-shaped island in the remote recesses of an uncharted, waterfront villa, Steve Jobs takes time away from his multitude of disease-curing creations to plot his latest reprise in response.
Upon hearing the news over their invasive, overpriced and over-bundled satellite, internet, tv and phone monitoring services, AT&T executives unceremoniously drop a load of coal down their neatly-pressed, flat-front, business trousers.
The cat and mouse game ensues into the new year.
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Excerpt from DevTeam:
3G Unlock
We have been working hard on a few other things. The main one being the 3G unlock codenamed “yellowsn0w”. This is now completed and is currently being packaged into a user-friendly application with the simplicity that you see in QuickPwn or BootNeuter.
* The target release date for the unlock is New Year’s Eve 2008.
* This unlock method is available to iPhone 3Gs that have 2.11.07 baseband or earlier, we did warn you.
* You can tell what version baseband you have by going to Settings->General->About->Modem Firmware
* The unlock requires a jailbroken 3G iPhone. It’ll be installable via Cydia and so it doesn’t matter if you have a Mac or PC.
* Please refrain from updating your baseband, regardless of what version you’re at. We’ll have complete directions on New Year’s Eve.
* We’ll stream a live demo of the unlock before Christmas (see the update at the end of this post)
Video Tutorial of Firmware 2.2 Jailbreak in Action
QuickPwn 2.2 is Completely “Plug ‘n Play”
Steps:
1. Upgrade your iPhone through iTunes to 2.2
2. Download QuickPwn 2.2 for Mac or Windows
3. Plug in your iPhone
“Choose Your Carrier…Again”
FuriouSim claims to have a working sim-based unlock for the iPhone.
A large slew of sim-altering devices flooded the market soon after the original iPhone was released. It was only a matter of time before they resurfaced to exploit the carrier locked iPhone 3G.
FuriouSim works by “tricking” your iPhone into believing you are using an AT&T sim card. This “unlocks” the iPhone, allowing you to make calls on your own network.*
Sim-unlocks have notoriously claimed to be impervious to iPhone firmware updates, yet, a relatively unheard of FuriouSim becomes first on the scene with a (claimed) “working” carrier unlock for the iPhone 3G.
Wikipedia Exerpt on Sim Unlocks:
The Turbo SIM (also known as TurboSIM) is considered the forerunner of a large family of “Dual SIM” devices (HyperCard, HyperSIM, China3GPP, StealthSim, MagicSIMetc.) that piggyback on a telephone SIM card to alter its normal operation.
More specifically, the Turbo SIM can be used to spoof the IMSI number and authentication key (Ki) supplied by the SIM card to the network, allowing network-locked phones (such as the Apple iPhone[2][3], and more recently NTT DoCoMo and SoftBank phones) to be used on mobile networks for which they were not originally designed or permitted.
*FuriouSim requires a Pwned iPhone to work
(check Officially Pwned for more info)
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