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With the addition of a 720p HD camera and the iMovie video editing app, the iPhone 4  is a mobile-video powerhouse. But HD video creates large files and the iPhone 4 tops out at just 32GB of storage, so the question is: how much video can you record on the iPhone 4?

The answer comes in two parts: video size and storage.

Video size
For the sake of this article, I’ll assume you’re shooting video at the highest-quality HD settings the iPhone 4 offers. In that case, a 1-hour video will take up about 4.73 GB of storage space on the iPhone.

Storage
Knowing that 1 hour of video take up 4.73 GB of storage doesn’t quite tell you how much video the iPhone 4 can hold. That will be determined in part by what else you have loaded on the phone.

Since most users will have some apps and some music, in addition to the OS, let’s assume that the average user will have at least 10 GB of content already on the phone. In that case, the iPhone 4 can hold the following amount of video:

16 GB model – 1 hour
32 GB model – 4 hours

The iPhone Dev Team on Wednesday released the latest hack that allows a jailbroken iPhone 4 to be unlocked and used on any wireless carrier.

The unlock solution is called “ultrasn0w,” and works with the latest version of Apple’s smartphone, as well as iPhone 3G and iPhone 3GS.

But to use it requires an iPhone that’s been jailbroken. The same group released a jailbreak program for the iPhone 4 over the weekend by exploiting a security hole in the mobile version of the Safari browser. That jailbreak brought attention to the fact that navigating to a certain site via any iOS device can present the exploit as a simple PDF link, which requires no explicit user action short of clicking a link. It can then launch an exploit that takes advantage of the way the PDF viewer loads fonts, which could enable a program to have unrestricted access to the device. Apple says it is looking into the problem.

Jailbreaking an iPhone is still considered by Apple as a quick way to void the warranty since the act breaks the user agreement. But legally, it’s now allowed. Last week the U.S. Copyright Office amended the Digital Millennium Copyright Act to allow consumers to bypass a handset manufacturer’s protection mechanisms to allow “handsets to execute software applications.”

But while handset owners are explicitly allowed to jailbreak their own phones, the Copyright Office did not appear to extend that to allow third parties to supply jailbreaking software in order to switch carriers.

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If you’re one of the millions of people around the world who have managed to scoop up the hot new iPhone 4 ,  you’re now probably trying to decide if you should purchase an iPhone 4 case . Cases are a good idea for any cell phone, and especially for the iPhone 4.

First of all, there’s the famous “reception” issue that we’ve all heard about . With the iPhone 4′s antenna and dropped call problems widely reported that the new iPhone 4‘s have, it is important  that you have some sort of cover  to shield  the antenna from from the wildly famous “death-grip” problem that has been reported in the media . The basic iPhone 4 bumper case that Apple is now giving away will solve that problem for your iPhone , however  there are countless third-party Apple iPhone 4 cases that are better looking  and offer more protection for the rest of the Apple iPhone  as well.

The biggest benefit of having an iPhone 4 case, is to protect the new Retina display screen and overall body of the iPhone. . The iPhone 4 is a very attractive phone, with a smooth and sleek design, so avoiding scratches and scruff marks  is important.  Moreover, while the new iPhone 4  is a pretty durable phone, care should be taken not to  accidentally drop  or crack the screen, so a good case needs to be able to protect the phone from scratches as well as act as a shock absorber to protect the functionality of the phone, and protect the touch screen from scratches and cracks.

Since it also has a camera, you should also take steps  to safe guard  the camera lens from dirt and scratches as well.  A good iPhone 4 case will have a clear covering that covers the screen as well as the new HD video camera lens, without impeding the use of the HD camera.

All external buttons and plug in ports  should be sheltered from dirt and debris too. A common problem is dust, pocket lint, sand and all sorts of debris getting into the accessory port on the iPhone. Once the connections in the port get embedded with dirt, the data cable, charger and other accessories no longer work. An effective iPhone 4 case will protect the iPhone from such dirt and debris, so you don’t have to worry about these things causing unwanted issues with your new iPhone.

Another important benefit of an iPhone 4 case that you may not have thought of is style and individuality. The Apple iPhone 4  itself is a stylish and sexy phone, but since there are only black & white versions available,  they all look the same.  A cell phone case can be a very eye catching and attractive  accessory and can express your individual style and personality.

In summary , an iPhone 4 case is a must for any iPhone 4 owner. An iPhone 4 case can solve the notorious reception  problems ; protect the investment of the iPhone  and even  make a fashion statement all at the same time.

How much would a recall of the iPhone 4 have cost Apple? Were the apparently wireless connectivity issues problematic enough, Apple would have had to pony up nearly $1.5 billion to pull back its iPhone 4 smartphones with a product recall.

It thus makes sense that the company’s free-bumper fix-it—while coming in at a cost of $175 million, according to Apple CFO Peter Oppenheimer—is nevertheless a substantial discount compared to the alternative. The price of the “free case” program was revealed in a Q&A session with Oppenheimer following the company’s third-quarter report this past week.

According to the CFO, Apple was planning on deferring revenue for iPhone 4 units that have already been sold—sans bumper—to create a pool of cash with which to provide all customers with the aforementioned free case.

“I expect the accrual we’ll need to make (a revenue accrual with no cost) will be about $175 million in September quarter and will be recorded as revenue in the December quarter,” Oppenheimer said. “We will expense the cost of Bumpers when we ship them to customers and our most important objective is to take care of every customer.”

As well, Apple has recently taken the iPhone 4′s actual “bumper” off of its Apple Store, presumably to shore up supplies as it begins shipping free cases to the entirety of its iPhone 4 purchaser base.

And just how many users could be eligible for the program? According to CEO Steve Jobs, Apple sold more than 1.7 million iPhone 4 devices within three days of the product’s release. The subsequent “Antennagate” press conference revealed that iPhone 4 sales are up to 3 million and counting (in just over three weeks).

That said, Jobs fully expects Apple to be unable to fulfill the immediate request for a free bumpers by iPhone 4 users worldwide.

“We can’t make enough bumpers. So what we’re going to do, is source some other cases and give users a choice of cases. And they’ll be able to pick one,” said Jobs during his July 16 press conference.

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