
Verizon topped the rankings, followed by Sprint and then T-Mobile USA. Verizon received top marks for customer service, voice quality and data quality. Verizon was first last year, as well.
T-Mobile and Sprint saw average ratings across the board.
On the bright side for AT&T, the carrier received the top ratings for its 4G LTE network, meaning it received less complaints on the service than Verizon or Sprint did. T-Mobile has not begun rolling out their LTE network yet. AT&T also has the fastest LTE, at an average of 9Mbit/s compared to Verizon's 7.5Mbit/s.