This infographic illustrates the mCommerce market, from rising regions, to average order value, to mobile coupon use and payments.
Comcast had the lowest customer service rating of the 233 companies measured, while USAA took the top spot for the second consecutive year.
Amazon and L.L.Bean were the standard-bearers, each with a score of 90 on a 100-point scale.
Amazon led all retailers tracked in customer satisfaction with mobile retail experiences during the holiday period.
Amazon maintained its leading index score of 88 (on a 100-point scale) from last year, the highest score since the study began in 2005.