Is it ethical for Apple to restrict the iPhone?

Many wireless users diagree with Apple policies that stricty reserve iPhone access to AT&T subscribers. When it comes to owning an iPhone, it's a "take it or leave it" situation. Is this practice a fair business strategy or a violation of consumer rights?

Handcuffs Chafe Wireless Users
USA Today
By: Leslie Cauley
Aug. 23, 2007

"To many, the Apple (AAPL) iPhone is the ultimate wireless device — a seductive blend of technology, function and dead-on cool, all wrapped into a sleek package.
To others, it's a glaring example of what's wrong with the U.S. wireless industry in general.

The iPhone offers superior technology, but public policies in this country allow (Apple) to chain that technology to one massive company, AT&T (T), rather than allow consumers to make the choices they want," charges Josh Silver, co-founder of Free Press, a consumer advocacy group. His latest campaign — "Free the iPhone" — promotes an open Internet and consumer-friendly public policies for mobile devices. The website (www.freetheiphone.org) has resulted in 'tens of thousands of supporting petitions,' he says...."
http://www.usatoday.com/tech/wireless/2007-08-22-cellphones-abroad_N.htm