The cheapest model of Apple's new iPhone, which is about to go on sale for $199 in the U.S., costs about $173 to make, according to an...

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NEW YORK — The cheapest model of Apple’s new iPhone, which is about to go on sale for $199 in the U.S., costs about $173 to make, according to an estimate by research firm iSuppli.

The phone, which updates last year’s model with faster Internet speeds and an improved navigation feature, goes on sale July 11.

Apple’s profit is much more than the $26 difference between the cost and retail price. The retail price is subsidized by the exclusive carrier, AT&T. In effect, the carrier will be buying the phones from Apple at a higher price, then selling them at a loss that it earns back through monthly service fees.

ISuppli estimates that AT&T will subsidize each phone by $300. Other analysts have put it at $350. In either case, the subsidy creates a substantial margin for Apple.

ISuppli said the margin appears to be higher than for other Apple products, which are generally priced 50 percent higher than their cost of materials and manufacturing.

Because the cost of components has come down, the margin is also higher than for the original iPhone, which was introduced last summer. ISuppli then put the cost of the model at $226.

The $173 estimate applies to the iPhone version with 8 gigabytes of internal memory. A model with twice as much memory will cost $299 from AT&T, but the extra memory costs Apple only $22.89 more, according to iSuppli.

Apart from the memory, the most costly components of the new phone are the touch screen and the underlying display, at $20 each. The Global Positioning System chip, missing from the first iPhone, costs $3.60.

The cost estimates don’t include software development, packaging, shipping or included accessories like headphones.

The phone will go on sale in 21 other countries July 11 at varying prices, all subsidized by carriers.

Apple shares rose 9 cents to close at $173.25 today.