Overall satisfaction among smartphone customers increases significantly as manufacturers continue to improve styling, feature sets, usability and software, according to new data from J.D. Power and Associates.

For the ninth consecutive study, Apple ranks highest among manufacturers of smartphones in customer satisfaction. Apple achieves a score of 855 and performs particularly well in physical design and ease of operation. 

The research group's studies measure satisfaction with traditional wireless handsets and smartphones among customers who have used their current mobile device for less than one year. Satisfaction is measured in several key factors. In order of importance, the key factors of overall satisfaction with traditional mobile phones are performance (29%); ease of operation (26%); physical design (24%); and features (21%). For smartphones, the key factors are performance (33%); physical design (23%); features (22%); and ease of operation (22%).

The Wireless Smartphone Satisfaction Study finds that satisfaction among smartphone customers is 796 (on a 1,000-point scale), an increase of 22 points from 2012. This improvement is likely due to a growing array of new features and services being offered that are providing a seamless product experience between the operating system functions and third-party apps.

While satisfaction in all factors of the smartphone customer experience increases from 2012, satisfaction has increased the most in performance (26 points), as a few key attributes, such as operating system reliability, processing speed and video/camera picture quality, have improved significantly.