T-Mobile USA leads the four major wireless carriers in customer satisfaction, having moved ahead of AT&T and Verizon Wireless in the past year, according to an American Customer Satisfaction Index (ACSI) report released today.

Wireless carriers overall outperformed home Internet and subscription TV providers, a reflection of the greater competition in the mobile industry. Internet service and pay-TV companies ranked poorly in the latest ACSI report, just as they did in another recent customer survey. “Innovation tends to be strongest in markets with multiple companies vying for consumer preference,” ACSI founder and Chairman Claes Fornell said in a press release. “There are numerous wireless carriers and plenty of different cell phones to choose from. The same is not true for pay TV and ISPs, where consumers are usually beholden to a duopoly.”

T-Mobile scored a 74 on the ACSI's 100-point scale, up from 70 last year, while AT&T and Verizon each scored 71. Verizon's score was unchanged, while AT&T rose one point since 2015. Sprint improved its rating from 65 to 70 in the past year. While T-Mobile was first among the four biggest carriers, TracFone Wireless beat all the major wireless companies with a score of 75.

T-Mobile also sold more smartphones than any US carrier in the most recent quarter, according to Counterpoint Research, though the self-styled "Un-carrier" is still only about half the size of Verizon and AT&T when it comes to total subscribers. T-Mobile has turned itself around dramatically in the past few years, with moves like killing contracts and automatic data overage charges, offering free (albeit slow) international data roaming and data rollover, and exempting music and video services from data caps (to the chagrin of net neutrality activists).

The ACSI's surveys ask customers about various factors including network coverage, call quality, billing, and customer service provided by stores, call centers, and websites.

Network quality was always the biggest limiting factor for T-Mobile, but the company has made improvements and is aiming to buy enough low-band spectrum to eliminate problems covering rural America and the insides of buildings.

On average, wireless phone companies posted a score of 71, while the averages for home Internet service and pay-TV were 64 and 65, respectively.

In home Internet service, Verizon FiOS led all providers in customer satisfaction, improving its rating from 68 to 73. Comcast was near the bottom with a score of 59, despite an increase of three percentage points over last year. Frontier was in last place, falling from 61 to 56.

Verizon FiOS also led all subscription TV providers with a score of 70, narrowly edging AT&T U-verse, the AT&T-owned DirecTV, and Dish.