Apple Inc. is on a roll.

The company’s stellar quarterly sales and earnings Monday not only reveal a well-run, well-entrenched company, but also show how important Apple is becoming as a platform for mobile e-commerce – by sheer market share.

On the conference call, chief executive officer Tim Cook touted the success of the iPhone and the Apple Watch. Although detailed unit sales of the Apple Watch were not released, sales of iPhones in the most recent quarter were 61 million units – a 40 percent increase over the same period last year.

Combined with the first quarter unit sales, the total iPhones sold in the U.S. were 135 million units. On a per capita basis, this means about 42 percent of the total American population purchased a new iPhone. In fiscal year 2014, the total iPhone sales were nearly 170 million units, which, on a per capita basis, represents more than half of all Americans buying a new iPhone.

According to AppleInsider.com, iPhones edged out Androids earlier this year to capture the most market share in the smart phone device space. Globally, Booz & Company expects the smart phone segment to grow 15 percent to 776 million units by the end of this year. And even though Apple’s iPads have seen flattening unit sales, Booz & Company see growth in all types of tablets – swelling from about 265 million units today to 445 million units by the end of the year.

For apparel retailers, the message is clear: make sure your ecommerce strategy and deployment leverages iPhones, smart phones and tablets.