AT&T network not ready yet for all Apple iPhone 3G S functions

PHOTO Apple Senior Vice President of Worldwide Marketing Phil Schiller announces the new iPhone 3Gs

AT&T's wireless network is having a hard time keeping up with the Apple iPhone, a top wireless analyst says.

That's the reason AT&T t isn't offering multimedia messaging and "tethering" options for the new $199 iPhone 3G S — lack of network juice, says Roger Entner, head of telecom research for Nielsen.

When the iPhone 3G S was unveiled last week, Apple aapl said it would offer both those features. "Tethering" allows a wireless device to serve as a broadband modem to provide over-the-air support for laptops, PCs and the like. Multimedia messaging, or MMS, enables users to attach video clips, audio files, pictures, etc. to text messages.

But when the list of global carriers offering the features was unveiled, AT&T wasn't on it. AT&T is the exclusive U.S. distributor.

AT&T says it plans to offer MMS "by the end of the summer," but it has so far declined to say when tethering might become available. As of Tuesday, that was still the case. The 3G S goes on sale Friday.

"Tethering will be available at some point," AT&T spokesman Mark Siegel told USA TODAY.

Meantime, iPhone users are gobbling up AT&T's network capacity at a record clip.

According to Entner, the average iPhone user eats up around 400 megabytes of capacity each month. Average smartphone usage is 40 to 80 megabytes.

Entner says the high usage is a testament to the power and popularity of the iPhone. "People really love that device and are using it intensively."

And network demands are only going to increase as pricing on the current iPhone 3G drops to $99, he says.

Part of the problem is due to iPhone's engineering. The device constantly checks back with the AT&T network, he says, making adjustments as necessary. The iPhone's "chatty" nature is one reason it performs so well. But the back and forth also eats up a lot of network capacity.

AT&T has more than 7 million iPhone users, Entner estimates, more than any other carrier in the world.

As a result, he says, "No other wireless network, in the United States or elsewhere, is nearly as loaded" as AT&T's.

Later this summer, AT&T plans to start upgrading its wireless software with "HSPA" — short for high-speed packet access.

Once the upgrade is complete — by 2011, AT&T says — "3G S owners will have a significantly better experience" on the mobile Web, Entner says. (HSPA isn't compatible with the 3G iPhone; you'll need to upgrade your device to take advantage of it.)

Speed will be the most obvious change, Entner says. "It will be a lot faster — four to five times."

AT&T agrees the move to HSPA will have a lot of benefits for consumers. "We engineer the wireless network to stay ahead of demand," Siegel says. "That's why we'll start deploying HSPA later this year."

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