Among customers with unlimited data usage, customer care performance scores average 764.

Additional plan options not only increase overall satisfaction by offering customers access to newer features, but they may also reduce the number and severity of problems customers experience that require contacting the carrier, said Kirk Parsons, senior director of wireless services at J.D. Power and Associates. For example, unlimited usage plans may reduce the number of contacts pertaining to overages and incorrect billing, which helps to sustain and improve levels of firstcontact problem resolution and wait times.