You will have to perform the Jailbreak each time there is an iPhone update (or just don't install Apple's updates). Other than that, everything works as normal with syncing, etc.

Personally, I don't think it's worth the work, but if you must have that one app... Weather or not it's possible to get screwed is entirely up to Apple and what they decide to do in the future. So there's no way to know for sure.

IphoneVideoRecorder is popular...
http://www.iphonehacks.com/2008/04/video-recorder.html
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Reportedly, AT&T can disable your phone if you've tampered with it upon updating. I've heard plenty of people say it has happened, but many websites claim to be able to do it without being noticed. Don't know if any live up to the claim.

Good luck.
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http://news.timtechs.com/wp-content/uploads/2008/02/pwned-iphone.gif
In essence, what occurs when an iPhone is “jailbroken” for forensic examination is that select Apple File Protocol is used to boot what is called a Ram Disk (An area of RAM that acts as if it were a disk drive) into the iPhone’s running memory. This Ram Disk then mounts the iPhones filesystem and the forensic payload is copied into the filesystem. The iPhone is then rebooted and the payload executes its tasks (for instance, installing traditional Unix tools such as DD and SSH for making disk images and secure networking).

This is of course a simplified explanation, readers who seek more detailed and thorough discourse are invited to read Jonathan Zdziarski excellent book on the subject that is cited at the end of this post.

Forensic Implications of Jailbreaking--------

You may find yourself in a situation with an iPhone where “Desperate Times Call For Desperate Measures” and need to use the jailbreaking method of examining the iPhone. However, one needs to bear in mind that it isnt really and truly forensically sound and does in fact violate Apple’s copyright and ACPO. Remember the four principal tenets of the ACPO guidelines

No action taken by law enforcement agencies or their agents should change data held on a computer or storage media which may be subsequently be relied upon in court.
In exceptional circumstances, where a person finds it necessary to access original data held on a computer or on storage media, that person must be competent to do so and be able to give evidence explaining the relevance and the implications of their actions.
An audit train or other record of all processes applied to computer based electronic evidence should be created and preserved. An independent third party should be able to examine those processes and achieve the same result.
The person in charge of the investigation (the case officer) has overall responsibility for ensuring that the law and these principals are adhered to.
As you can clearly see, jailbreaking an iPhone violates at least the first of these tenets, and it is incumbent upon the examiner to understand thoroughly the method and report on it per the second. There is also a potential problem with the third tenet as well. The examiner should strongly consider whether the applications named in the beginning of this post obtain what is necessary before taking the steps outlined in the jailbreaking method so as to not only follow the ACPO guidelines but avoid possibly destroying evidence.

While effective and very clever the jailbreaking method can be dangerous, especially to examiners that are not used to the command line interface and manually carving data out of an image.

YOU MAY ALSO LIKE--
10 reasons to jailbreak your iPhone

1. Use your iPhone as a Modem

Your iPhone has an 'unlimited' data connection, it also has Bluetooth and Wi-Fi as does your laptop. Put the two together and you've got a terms and conditions breaching mobile broadband solution! iPhoneModem is such a ridiculously obvious and helpful thing it almost criminal it's not supplied as standard. (O2 do ban this specifically in iPhone contracts - beware.)

2. Get skins and themes

Why wait for Apple to charge you another £10 to add this with the next firmware update, when with WinterBoard you can have it now! With a host of incredibly complete themes already available you can customise everything from the lock screen to your Wi-Fi strength icons.

3. Sync Google Calendar

We're left incredulous that Google Calendar can't synchronise by default with the built in one. It beggars belief - especially when the email happily works with Google Mail. Thankfully NemusSync solves that problem beautifully with two way syncing at the press of a button.

4. Get Google maps offline

Sometimes the ingeniousness of people stuns us. But with OfflineMaps you can preload Google Maps that have been downloaded on your desktop using GMDL. It's not totally straightforward, but once you've done one it's easy and lets you access maps offline, though there's obviously no search.

5. Make and add ringtones

Free yourself from the tyranny of iTunes! A massive library of downloadable ringtones exist and neat little tools such as ToneFX can help you create your own and upload them easily to your iPhone, even shuffling them and enabling you to add them to text messages.

6. Read your documents

It seems insane but there's no direct PDF, text, Word or spreadsheet reader built in or available on the iPhone or iPod touch. Sure you can email PDFs to yourself, but that's not always convenient. Docs is a good stab at bridging the gap and provides a file browser to boot.

7. Get to grips with all the preferences

Everyone loves tweak tools and BossPrefs offers a host of handy extras, such as quick reboot and locks alongside the ability to hide many of the system status icons. So you can have your iPhone as busy or uncluttered as you like.

9. Easily toggle the Wi-Fi on or off

It might seem picky but we like saving seconds and that's just what WiFiToggle can do. No need to drill down though the Settings menus any longer, just tap the icon and it'll automatically enable and connect to any known wireless networks.

10. Go Open Source for media

While it's hardly perfect, we're glad to see that someone has got round to porting this Open Source media player to the iPhone. A touch on the slow side, so it'll need some work, but it's another step in the right direction to cutting out annoying and time consuming re-encoding.
Source(s):
http://www.techradar.com/news/phone-and-communications/mobile-phones/10-rea...

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