It provides Sprint, Verizon, T-Mobile, various retailers and other organizations with postage-paid boxes.

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Wireless carriers such as T-Mobile, Sprint PCS and Verizon Wireless are offering wireless data services that connect computers, phones and PDAs to the wireless Internet.

FORBES: Magazine Article

Same goes for T-Mobile, Sprint and Verizon.

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This is where the iPad (or Apple) has an advantage when it comes to tablets (even ignoring the fact that there are only 20 measly tablet apps for Honeycomb and almost 70, 000 for the iPad): Android mainly got pushed by Verizon, Sprint and T-Mobile shops (because they had no iPhone, and because most Android OEMs give the shops a better cut than Apple does).

FORBES: Apple iPad Doesn't Need Hideout From Honeycomb

And not least, he thinks Sprint and T-Mobile will both almost certainly lose subscribers to Verizon Wireless as it begins selling the iPhone.

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To make things concrete, compare the spectrum holdings of Verizon with those of Sprint and T- Mobile.

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That puts T-Mobile above Sprint in terms of 4G speeds, but below Verizon.

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While T-Mobile and Cingular use that standard, Verizon and Sprint operate on the CDMA (Code Division Multiple Access) standard, which is popular in North America but not supported everywhere else.

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Naturally, change within any industry takes time, but now that Sprint is in a position to offer unlimited data at a meaningful speed and T-Mobile has climbed aboard the bandwagon, Verizon may have to change its tune if a significant number of consumers decide that unlimited isn't dead after all.

ENGADGET: Verizon CFO buries his head in the sand, claims unlimited data is 'going by the wayside'