Data in this research brief is based on the Telecompaper Consumer Panel, which interviews at least 2,000 respondents on a monthly basis.There is a specific questionnaire on NPS that is answered by 3,500 people each quarter. The data in the graphs has a minimum sample size of n=60.
The Net Promoter Score is a customer loyalty metric. The Net Promoter Score is obtained by asking customers a single question: 'How likely is it that you would recommend our company to a friend or colleague?'.