After all the hoopla, the Apple’s iPhone debut on Friday more than lived up to expectations, with analysts estimating as many as 10 million sales by tomorrow and more than 130 million by the end of the year.. But there is a surprising quirk in the numbers. More than half of American mobile subscribers — 55.5 percent — are now owners of smartphones of all types, but for white people, the numbers make up just 45 percent, the lowest of any ethnic group, new findings from Nielsen show. Sixty-six percent of Asians, 56 percent of Hispanics and 55 percent of...