But carrier Sprint Nextel says the handset is equally useful as a business device and that companies and small businesses have been snapping up units.

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Principle No. 6 : Not all BTUs are equally useful.

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These are allies who not only posess the most deployable military forces in Europe, should America need them, but also have influence in parts of the world, from Europe to the Middle East and Asia, that will be equally useful if America's diplomats are to turn the coalition of sympathisers into something more useful and enduring.

ECONOMIST: First, build the coalition. Then, think what to do

But differences in age, experience, culture, nationality, and personal style can be equally important and useful.

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We love ETFs, but they are not all equally valuable or useful.

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All are innovating in various ways true but there are equally innovative and quite frankly more useful products coming out of Africa.

CNN: STORY HIGHLIGHTS

Mr Clinton may have been more blatant about his price tags, but his predecessors were equally aware that a night in the Lincoln Bedroom could cement a useful friendship.

ECONOMIST: Between the sheets

It's equally helpful for the families to feel as though they are doing something useful and meaningful for their loved one in the ICU, Glassman said.

CNN: Healing touch of family, friends aids recovery

The idea is that a maximally useful public information network aspires to treat all content, sites, and platforms equally.

FORBES: Net Neutrality Star Tim Wu Joins Federal Trade Commission as Senior Policy Advisor