Rephrase the main idea of the sample in your own words, without repeating words or sentence structure from the original statement.

"Right now, smartphones are selling like mad in the U.S. market, where sales jumped 84 percent between 2007 and 2008, according to NPD, the market-research firm."

We'll be happy to check what you think.

I have:

NPD have pointed out that smartphones have rapidly increased 84 percent from 2007 to 2008, and are currently selling fast in America.

Sounds right!

=)

Currently, there is a high demand for smartphones in the United States, with sales witnessing a significant increase of 84 percent from 2007 to 2008, as reported by NPD, a market-research company.