Apple and Samsung shipped about 470 million smartphones between them last year, just under half the total shipped worldwide. When you adjust for the fact that both companies are selling more expensive devices, the two account for more than 65 percent of the value in the smartphone market. Yet both companies seem uneasy. Samsung released financial information about its latest quarter on Tuesday, revealing a drop in profits for the second consecutive quarter. The company is still printing Korean won -- its profit was the equivalent of $8 billion -- but the portion of that net income coming from mobile phones appears to be in decline.