Apple has topped the second J.D. Power Wireless Smartphone Satisfaction Study of 2013, landing above competitors like Nokia, Samsung and HTC. This is the tenth consecutive time Apple has led the biannual ranking, and Apple has prominently mentioned this fact in the past. For the first time, the survey breaks out smartphone rankings by carrier. Verizon iPhone customers were the happiest with their experiences, scoring 861/1000, while AT&T iPhone owners ranked 856/1000. The iPhone led on all carriers except for Sprint, where it came in second place to Samsung. Apple did come in well above average across all carriers.