Tuesday was the first day people could place orders for the new iPhone 4 and a deluge of requests threatened to overwhelm the system. Is there an app for that?

Anticipation has been high since Steve Jobs unveiled the iPhone 4 earlier this month.

Apple offered a free app to current iPhone customers, allowing them to place orders from their phones.According to Forbes magazine, the crush of orders slowed the pace to a crawl.

In a statement, service provider AT&T called it the busiest online sales day in the company's history.

Upgrades to new model

The iPhone 4 features a higher-resolution screen, longer battery life and thinner design. AT&T is offering the iPhone 4 at $199 for the 16GB model and $299 for the 32GB model.

The iPhone 4 is about three-eighths of an inch thick; the previous iPhone was nearly half an inch. It is getting a camera on the front that could be used for videoconferencing, in addition to a five-megapixel camera and a flash on the back. It can shoot high-definition video, catching up to some other smart phones.

The display on the new iPhone remains 3.5 inches diagonally, but Jobs said it can show four times as many pixels -- the individual colored dots that make up an image -- as the previous screen.

The new phone will run the latest version of Apple's mobile software, now called iOS4, which Apple unveiled in April to offer such new features as the ability to operate more than one program at a time.

Older iPhones will be able to get iOS4 as a download June 21.

New applications for the device will include the popular game Farmville and one from Netflix that lets people watch streaming video where they left off on a PC.

CEO Steve Jobs opened Apple Inc.'s annual conference for software developers earlier this month. The iPhone 3GS, which debuted last year, will still be available, for $99.

Customers who pre-order the iPhone 4 will receive it June 25th or later, depending on when the order is placed. Phones will be available for purchase in stores on the 24th, on a first-come first-serve basis.

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