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Jailbreaking allows you to install unsigned apps. Unlocking is what you need, though in order to unlock you typically need to jailbreak (depending on your carrier, it's sometimes possible to get an official unlock).

Further, it depends on which 3GS you have - new or old bootrom. Old bootrom 3GS's can always be jailbroken by redsn0w - and it can tell you which bootrom you have.

There is a tethered 5.1 jailbreak right now(Limera1n should work on your 3GS), but if you power cycle (manually or run your battery dead) you need to start your phone in DFU mode and use redsn0w to do a tethered boot. If you are out and about, and unable to plug into your PC and boot tethered, you can use the semi-untether in Cydia to unlock basic phone functions but you'll still be unable to use Safari or any unsigned apps until you can do a tethered reboot.

Finally, as for unlocks: I'm unsure if this works on 5.1 or not, but there's a current bug with Apple's activation servers allowing you to fully unlock your phone for a specific SIM. The unlock is tied to that particular SIM, however, so you can't swap it for another carriers SIM later. Directions for this can be found, with links to the newest redsn0w and other valuable information, on the iphone devteam blog here: http://blog.iphone-dev.org/

Historically, the biggest group releasing jailbreaks has been the Dev-Team (guess what? this is not linked on TFS...). But I'd rather say that today security holes are mostly discovered by individuals (some of their twitter accounts are listed on Dev-Team's page) that usually coordinate on the jailbreaks test and release with the original Dev-Team members (MuscleNerd & c.). Along the way tho there were other individuals (like George "Geohot" Hotz and others I can't recall right now) that didn't like the ultra-careful Dev-Team approach on exploits release and went their own way, releasing sometimes unreliable hacks or, in any case, revealing the hole before a major firmware release from Apple or after a minor one. However these days I think everyone understood that the cat and mouse chase is getting dangerous, everyone is a bit more cautious and the hacks are relased only when it's worth it and when they are really proven to be stable for release on the wide range of devices/OS versions.

You can still downgrade to pre-iOS 5 releases if you have SHSH blobs saved for those revisions. Downgrading has been rendered "impossible" because the APticket used to verify ipsw's is now generated randomly instead of being solely comprised of data from the phone's ECID and firmware version.

More info here.

Sent from my easily jailbroken Android tablet.

1) Many "approved" android apps can and do modify the system more extensively, it's how a trojan app can send SMS without you knowing - impossible in iOS.

A trojan app can send SMSes only if you give it the permission to. I do recognize that many users won't read the permissions warning when they install an app, so perhaps Android had better display an additional warning dialog box each time a SMS is sent. (I also remember that in the case of Symbian, which worked that way for Java apps, people were annoyed because of the security pop-ups.) Anyway, if an app is caught doing anything in a fraudulent way, it will be yanked from the official market and from the devices that have it already installed.

That's every model, for every OS version.

The information I have tells me it is not the case. And what about WP7? No jailbreak at all for that.

Apple could shut down jailbreaking if they really wanted to - obviously they do not want to

But Apple do shut down known jailbreaking methods at almost every OS update. It's hackers that continuously find new ways to jailbreak.

is there a jailbreak for iPhone 4S

Yes there is. Google. Have you heard of it? You probably should have thought to use it before wandering so far out of the field of fact where you started.

All I found by Google were scam sites that wanted me to buy shady applications that are supposed to let me jailbreak. Obviously fake, since the upstream hacker blogs tell me that jailbreaking the 4S and the iPad 2 is not currently possible. The very first Google result is even marked by Google as a "harmful site". Next slashdot article: "Fake jailbreak scams spread to iOS"?

My, what bullshit fear mongering you have there Grandmother!

In reality many millions of people jailbreak phones regularly without issue (NO it does not void your warranty).

Have Apple changed their mind since they officially stated that jailbreak does void your warranty?

Good lord no. I don't hope to see such an exploit (though some exploit may be necessary to discover at some future point to jailbreak, for example, IOS5). The browser exploit used for the 4.3.3 jailbreak is only one method to jailbreak a device (a convenient one). Normally you plug it into your computer and run a program such as redpois0n to jailbreak the device, or you can load a pre-jailbroken custom firmware created using a tool such as pwnage tool or sn0wbreeze. Browser exploits are (almost) never a good thing. "Un-tethered" in the IOS jailbreaking lexicon simply means you can reboot your device without having to connect it to the computer.

This isn't true at all; 4.3.3 has an untethered jailbreak.

These guys did: http://blog.iphone-dev.org/

So, I'm a little unclear on this. The last I heard, the latest jailbreak code relied on using some iPad firmware that was a much higher version number than current built iterations of the iPhone codebase. The downsides of installing this, as spelled on on the dev team blog, revolved around revealing to Apple unequivocally that your phone was jailbroken (and violating TOS for warranty), as well as being unable to come back down from this jailbroken state due to newer version numbers still being lower than this iPad version. Is this no longer the case with the Greenpois0n update?

Yup, already out for testing.

Thu Aug 12 15:20:25 unknown MobileSafari[421] : MS:Notice: Loading: /Library/MobileSubstrate/DynamicLibraries/PDFPatch_CVE-2010-1797.dylib
[...]
Thu Aug 12 15:20:56 unknown MobileSafari[421] : Prevented PDF Exploit
Thu Aug 12 15:20:56 unknown MobileSafari[421] : FT_Load_Glyph failed: glyph 1: error 130.
Thu Aug 12 15:20:56 unknown UIKitApplication:com.apple.mobilesafari[0xc4c][421] : Thu Aug 12 15:20:56 iphone MobileSafari[421] : FT_Load_Glyph failed: glyph 1: error 130.

And suddenly jailbreaking is the smart security option for all the users that Apple left behind.

Apple has not released the fix for the iPod Touch 1G and the iPhone 2G, so the iPhone Dev Team themselves are working on a fix that will work on all devices. So you'll be able to basically jailbreak and then plug the hole that was used to do it.

Because of the dev-team and their wonderful jailbreaking abilities I'm ok with iPad's DRM. The iPhone is ok on it's own and it's spectacular after you jailbreak it. It's not that tough and doing that can break Apple's controls.

I'll buy an iPad after I can jailbreak it. If you can't open it, you don't own it.

Read the comments on the Dev Team's website (latest thread here: http://blog.iphone-dev.org/post/153409604/recycling-goodness) - now tell me that the average Joe doesn't actively seek out how to jailbreak/unlock.

Now my head hurts from reading pure stupid.

http://blog.iphone-dev.org/

Jailbreak it. You'll be a lot happier.

actually the iphone dev-team has had a hack for it, but they've been sitting on it in anticipation of apple releasing a 3.0.1 or 3.1 in the near future. they didn't want apple to patch the hole. http://blog.iphone-dev.org/

Download the purplera1n tool and then unlock using ultraSnow using the guide here: http://www.iclarified.com/entry/index.php?enid=4253

The only problem with this hack is that Winterboard still doesn't work. For that you will want to wait until the iPhone Dev Team releases their updates. The Dev team STRONGLY RECOMMENDS that you obtain your IBEC/IBSS files and described on http://blog.iphone-dev.org/post/133799347/your-3gs-temporary-solution with a windows tutorial here: http://www.iclarified.com/entry/index.php?enid=4399

This program found here http://difrnt.com/blog/?p=25 will automatically copy the files out of the Windows Temp Directory when you do the restore on your iPhone in order to get the device. You don't need to perform a regular restore, just a DFU restore in order to obtain you iBEC and iBSS files (the guide tells you to restore once, normally, then once in DFU mode).

The 3GS unlock & jailbreak has been available since midnight last night.

http://blog.iphone-dev.org/

The usual culprits (the iPhone DevTeam) were waiting until the 3.1 release but it looks like their hand was forced by an independent hacker releasing his jailbreak on Friday.

There was a LOT of stuff you after jailbreaking (background apps, tether, etc) on the 1.x and 2.x OS releases but as Apple adds more features with each consecutive release, I'm finding the need to jailbreak a little less compelling. I still will, b/c I find a terminal + SSH alone to be compelling but once tethering is official, I may just go back to an un-jailbroken state. I still need the unlock, of course.

Actually, it is

I'll post a link, there's nothing illegal about it:

http://blog.iphone-dev.org/

And to add to this, they explicitly say they don't want any donations.

We've seen some comments about you lovely people wanting to donate money to us. We'd just like to say that we DO NOT accept donations. There is no paypal account associated to us, there is no way to donate to us, we do this as a hobby and don't want to be paid and we fund all of this ourselves and it works out just fine.

Anyone who says "donate to DevTeam" in our name is lying, so don't send them anything, you'll just fund their crack habit.

Keep your dough for the lovely shiny Apple products, we think you'll need it.

If you do want to send us something, please send a scan of a postcard from your city, handwrite a nice message scan it and sent it over to blog@iphone-dev.com

http://blog.iphone-dev.org/post/41744653/donations-to-dev-null

Please ignore this non-financially motivated faction... I will accept all your cash donations and use them towards this project.

And to add to this, they explicitly say they don't want any donations.

We've seen some comments about you lovely people wanting to donate money to us. We'd just like to say that we DO NOT accept donations. There is no paypal account associated to us, there is no way to donate to us, we do this as a hobby and don't want to be paid and we fund all of this ourselves and it works out just fine.

Anyone who says "donate to DevTeam" in our name is lying, so don't send them anything, you'll just fund their crack habit.

Keep your dough for the lovely shiny Apple products, we think you'll need it.

If you do want to send us something, please send a scan of a postcard from your city, handwrite a nice message scan it and sent it over to blog@iphone-dev.com

http://blog.iphone-dev.org/post/41744653/donations-to-dev-null

Why not link to http://blog.iphone-dev.org/ themselves ?

Oh wait ... this is /.

My Bad.

Let me know when there's a nice ipod-like device with 8-16GB of flash, a nice touch screen (with or without keyboard), sans-phone that runs Android, for about $250. Then I'll get excited about Android. In the meantime my ipodtouch is everything I've ever wanted in a PDA, except that the open source ecosystem is very stunted, thanks to Apple's controlling view of things, and also the so-called shareware scene that has always pervaded Macdom. Paying a buck for some stupid little app doesn't sit well with me, especially when I'd often write the app for myself for free based on OSS if I could, but I can't. I don't own a Mac that I can run Xcode 3.1 on, I don't want to pay apple for a provisioning key.

So why not go the next step and jailbreak your iPod Touch? It is still a valid option, and there's tons of little apps (many of which Apple obviously won't allow in their app store). If you had an iPhone, you could download a tethering app rather than pay for NetShare (which is gone). Heck, Podcaster started as a jailbreak application. And given the installer of choice is Cydia, well, apt-get and dpkg are your friends. And you can develop your own apps, too!

Here's a small list of 10 must-have apps for your jailbroken iPhone/iPod Touch. In particular, I do recommend MxTube - download and watch YouTube videos (rather than stream the videos). I don't think there's any other mobile platform that has a YouTube app that downloads the videos for later replay (offline).

Sure it's not a true open platform, but more like console systems that everyone finds fun in hacking.

But... there is! :)

http://blog.iphone-dev.org/

Doesn't look like this story covers anything involving the 3g iPhone, it even mentions that you need the 1.0.0 version of the firmware, which the 3g never even shipped with (or can run)! This is talking about the old iPhone with the 2.0 software, nothing exciting. Check out the iphone dev team blog for real news about the 3g running with non signed apps, they released today! http://blog.iphone-dev.org/