Well that the guarantee thrown out the window then.
I have an iPhone 4 and also iPad 2 and no way will I jailbreak it just to get some stuff I don't even need then if it breaks down I'm on my own? Don't think so.....

Jailbreaking an Apple device has benefits and risks, and is not illegal, according to security company Sophos. Benefits include the freedom to build and run software from alternative sources, and the ability to copy files of your choice without agreeing to the iTunes end-user agreement, Sophos said in a blog post on Sunday. Risks include invalidating Apple's warranty, and installing software which may make the device unusable, said the blog post. Users are more likely to encounter malicious software, so IT managers should include a "no-jailbreaking" clause in Bring Your Own Device policies, said Sophos.

If you jailbreak your phone or iPad, you can kiss any apple warrantees that came with it goodbye.

Personally, the only thing I think the iPhone is missing is that cool zig-zaggy unlock screen Droids have.

Its safe to do if you are careful and make backups, i did mine a few days ago.

jailbreak = no warranty = MYTH

just click update software on your device, bye bye jailbreak

oh and its a right pain in the rear when you update and have to jailbreak afresh......

This was the easiest jailbreak to do so far.

Just plug it in and it is all done VIA software.

No debug mode frustration...

Nothing like being able to actually use my 50 dollar unlimited data plan and tether devices without being nickled and wait 20 more dollars !!!!!

Nothing like being able to install custom themes and being able to change the layout and font size and position of my icons.

I really love my infinite dock with scrolling bottom bar with seven icons showing. Oh its also nice to choose how many icons you want in a row instead of the default 4 you cant change without the jailbreak.

I really enjoy SBSetting so I can actually use my iphone in landscape mode.

Dont you hate it when you want to download something off the app store on your 3g connection and you CANT because the APP store wants you on a wifi connection.... Well I don't have that problem cause of the jailbreak

The TVout mirror app is wonderful so I can stream ALL video / mirror the iphone screen VIA TV out.

I buy the hardware I want to do WHATEVER I WANT TO WITH IT.

So it might not be illegal, but why would you want to intentionally irritate the most powerful corporation on earth? A corporation that has an ex NSA operative running its security? Let sleeping dogs lie I say. Why put yourself on a list of cuppertinos most wanted, just so you can install a few dodgy apps without paying for them? Do you have a death wish or something? When google merge with Facebook and apple buy that entity out, why would you want to be on the wrong side of "the beast"? Your actions now have consequences in the future.